Effort Estimation Model

Effort Estimation Model Effort Estimation Model for each Phase of Software Development Life Cycle Information Technology Abstract Assessment of main risks of software development discloses that major threat of delays are caused by poor effort / cost estimation of the project. Low / poor cost estimation is the second highest priority risk [1]. This risk can affect four out of total five phases of software development life cycle i.e. Analysis, Design, Coding and Testing. Hence targeting this risk alone may reduce the over all risk impact of the project by fifty percent. Architectural designing of the system is great activity which consumes most of the time in SDLC. Obviously effort is put to produce the design of the system. It is evident that none of the existing estimation models try to calculate the effort put on designing of the system. Although use case estimation model uses the use case points to estimate the cost. But what is the cost of creating use cases? One reason of poor estimates produced by existing models can be negligence of design effort/cost. Therefore it shall be well estimated to prevent any cost overrun of the project. We propose a model to estimate the effort in each of these phases rather than just relying upon the cost estimation of the coding phase only. It will also ease the monitoring of project status and comparison against planned cost and actual cost incurred so far at any point of time. Key Words: Effort estimation, software development life cycle, Risk Mitigation, Project Planning. Section 1:Back Ground and Motivation Existing estimation techniques such as Functions point estimation and use case estimation rely upon the artifacts generated in earlier phase. These artifacts (i.e. Use case diagrams, class diagrams, sequence diagrams, activity diagrams, state chart diagrams etc) depict the architectural design of the entire system. These diagrams are not generated out of a blue or are not instantly available without putting any effort. Standard task set and the percentage of work duration associated with it decomposes the ratio of effort put in each phase. Activity Standard Work Effort% Definition Phase Business Requirements 6% Functional Specifications 10% Delivery Phase Detailed Design 14% Code and Unit Test 40% System Testing 20% User Acceptance Testing 10% Total Effort 100% Table 1 Standard Task Set Work Duration %age [4] It is evident in Table 1 that although major ratio (i.e. 40%) of work effort is put in code and unit test phase. The rest 60 percent effort is put in different areas of the project development life cycle. Hence this signifies the importance of estimating cost for these phases of software development life cycle. Usually the effort estimation is done after the analyses phase when the project reaches into coding stage. The cost / effort is measured in terms of line of codes for each functionality to be incorporated into the software. Therefore it is very clear to understand that only 40 % (i.e. as shown in table 1) of the total software development effort is estimated. Whereas this estimation is delayed until all the analyses and design has completed. We have adapted a different approach and suggest that effort estimation shall be carried out for each phase of the development process. We propose this model to avoid the risk of low cost estimation as earliest as possible in the development process. Current software cost estimation methods first try to know the size of the software to be built. Based upon this size the expected effort to be put is measured. Estimated effort further is utilized to calculate the duration (i.e. Time required) and cost (monetary/human resources) of the project. Calculating the size of project is the foremost logical step to be taken in order to estimate the effort. If we do not know the distance to be travelled we can not estimate the cost and duration per mileage. Therefore we also first measure the size of the entire project. We know that there are mainly three categories of software projects i.e. Organic mode: These are relatively small, simple SW projects (application programs e.g. Thermal analysis program) Embedded mode: System programs which are developed within tight HW, SW and operational constraints (flight control SW for aircraft). Semi-detached mode: An intermediate level (size and complexity, utility programs) SW projects with mixed experience, mixed requirements. It can be mixture of organic and embedded software as well. Therefore these categories of the software project would effect the estimation of each phase. We propose the modular approach to be adapted for the development efforts so that even large scale enterprise information systems can also be decomposed into a mix of several modules of organic, semi detached, and embedded system. Therefore the focus can be put in individual module accordingly. Following are the sections which individually discuss the methods to estimate the expected effort to be put in each phase of software development life cycle. Section 2: Measuring the Size of each project We do not try to measure the size of the project as a whole rather focus on measuring the size of each phase i.e. Analyses, design, coding and testing phases. This can provide us different milestones in the road map of project development. Our main objective is to suggest the estimation methods for analysis, design and testing phasing. We do not focus much on coding phase, as we would refer to the already done work for this phase. We estimate the size of each phase based on the artifacts and project products which are produced in that particular phase. E.g. the analyses phase produces the detailed user requirements document (use cases etc), design phase produces the class diagram, database Model i.e. E-R diagram, Sequence diagrams, activity diagrams etc. based upon these deliverables in each phase the time and effort to produce these are estimated. Figure 1 shows the step wise flow chart of entire project planning process. After the identification of project scope/objectives, characteristics and infrastructure, the identification of all the activities is done. This identification of activities at early stage may provide the strong basis to estimate the size of each individual phase of software development process. As this involves the work break down structure to be defined and can identify the product / deliverable of each phase. Figure also shows that based on this identification of each activity the cost and risk are estimated for each activity. As this is part of project planning. Therefore we can obtain this information in the most earliest phase of project planning and do not need to wait for longer duration as have to wait in existing cost estimation models to estimate the cost of construction of the software. Hence early stage activity identification can help us to estimate the cost/effort for each phase i.e. analysis, design, coding and testing. Figure 1. Step wise Project Planning [3] Moreover the responsibility of the analysis and design of the system goes to the systems analyst. Generally system is viewed in terms of a collection of sub systems therefore each sub system analysis and design is the responsibility of any individual analyst. Hence the human resource need is very clear for analysis and design phase. But when team work is done in coding and testing phases then more stressed has to be put to estimate the required human resources. Bruegge defines the following work products to be generated in each phase of software development life cycle. Figure 2 Software Life Cycle Activities. [6] Bruegge describes and decomposes the overall system model and design into three types of design models i.e. Analysis model Object Design model Behavioral model Section 3: Requirement Elicitation Analyses Phase Size and Effort Estimation In earlier phase of the development process the scope is defined. This may also provide an intuitive vision of project size to the experienced project managers. Unified Process for software development defines the work products in different phases. [2] During the analyses phase we propose Inception points to be identified and estimated. Inception points refer to the points which must be analyzed about in context of the interest of each stakeholder. As use cases represent the points of some business operation or systems functionality, which needs to be clearly understood and modeled therefore we call them inception points. We must know the accurate number of inception points and the effort needed to develop those points. Unified process for software development describes the following main work products in Inception phase. Definition of the problem Identification of all stakeholders Identification of Functional / non functional requirements Validation of requirements [2] Therefore all the main inception points can be clearly identified. Inception point will mainly focus around the identification of the users / stakeholders (possible actors functionality needed) and requirements. The size can be estimated for this phase by estimating the requirements. This can further be utilized to estimate the cost to build the use cases for each requirement. We suggest that the elicitation of requirements may consume effort / cost relevant to the number of requirements and user present. No of Requirements No of Users Project Size Less than 25 1-10 Small 25 50 11-50 Average 50 above 50 above Large Table 2 Project size based on no of requirements. Table 2 can signifies the need to enumerate each requirement, moreover each requirement will produce a use case and would also identify all its possible actors. Hence this can produce the effort needed to build those use cases which need to be documented in the software requirement specification document. Use cases can also be weighted to measure their complexity. So that the size can be determined and the time taken to create those use cases can be determined. No of Processing Points No of Actors No of > Use case Time taken to develop No of Person 1-3 1-2 1-2 3 Hours 1 4-5 3-5 3-5 5 Hours 1 5 + 5 + 5 + 7 Hours 1 Table 3 Use Case Types We have categorized the use cases based upon the number of processing points. actors, and the extension use cases which emerge from that particular use case. We conducted a survey to get the opinion from experienced software engineers and project managers in different software houses. We had distributed the questionnaire which primarily contained the questions to ask about the time needed to develop different types of use case as described in the table 3. We have processed the survey data and have obtained the average time for each category of the use case. Hence we can sum up the total number of inception points and can multiply them by the number of hours required for each type of use case. Summing up the time required in hours for each type of use case can then further give us the total number of hours required to build inception points. Section 4:Design Phase Size and Effort Estimation Object design model and behavioral model are produced during the design phase. We can estimate the size of each model alone and can sum the effort to obtain the total design phase effort. We can identify the Design Points, therefore we can add the weight associated to each design point and hence can measure the size and effort of that particular design point. This gives the lower level granularity to perceive the effort and size of each possible system feature to be designed. Hence further gives us tighter grip on the project progress. Following can be the possible design points: Entity classes Boundary classes Control classes System decomposition System integration Aggregation / composition of objects Generalization / specialization of objects Object interaction Interfaces Application logic 4.1Object Design Model Size and Effort The main artifact of the Object model is class diagram. Class diagram is comprised of several entity, control and boundary classes. If Entity Relationship diagram has already been produced then the effort can be lessened as persistent object are already been identified. Further more each type of classes need to be designed very carefully as control classes depict all the processing and interaction responsibilities among the classes. Where as boundary classes are responsible for the interfacing with either other system components, users, or external system for electronic data interchange. We declare each class to be a design point. A class in the system primarily depicts a systems object which interacts with other objects in systems environment. Hence a class does not dangle into a void but have solid connections and interactions with other classes that must be very accurately and rightly designed. Therefore we can categorize the class based on the complexity of their design. A class would be difficult to design if it has many associations , aggregations, generalizations, functionalities, overloading, overriding etc. Table 4 depicts the parameters to judge the complexity ratio of any class to be designed therefore the effort would be relevant to the complexity ratio. Complexity Ratio No of Associations No of Interactions No of Methods No of Interfaces Time Required (Hours) Low None None 1-5 1 2 2 Medium Single Single 5-10 2 5 5 High Multiple Multiple 10-20 5 10 8 Table 4: class categories for design complexity Our conducted survey tells us that based upon the complexity ratio any class can take 2, 5, or 8 hours for designing. Remember that this time is for design of the class but coding can take extra effort in the coding phase. Therefore if we can obtain the total number of design points and multiply them with the hours required to get the total hours required for the entire class diagram. 4.2Behavioral Model Size and Effort Behavioral model comprises of different diagrams which depicts the state, interaction of different classes with each other and the sequence of activities performed in the system to achieve any objective or perform business function. These diagrams are sequence diagram and state transition diagrams mainly. We declare each of these diagrams to be the design point as it is very essential to trace the possible states of the system so that a good design can be obtained. Whereas the sequence diagrams is the most sophisticated diagram that shows the complete step by step functionality and participating classes. But if the functionality of the existing system has been well understood then creation of sequence diagrams become easier. Our surveyed data reveals the facts that each of these diagrams can be different in complexity level i.e. low, medium, high. Parameters involved for determining the complexity level are summarized in table 5 below. Complexity Ratio State Chart No of States No of Transitions / Events No of Activity of State No of Actions associated with states Time Required (Hours) 1-5 1-5 1-5 1-5 3 5-10 5-7 5-7 5-7 5 10-15 7-10 7-10 7-10 8 Sequence Diagram NO of Classes No of Actors No of Events No of Control, boundary Entity Objects Time Required (Hours) 1-5 1-5 1-5 1-5 3 5-10 5-7 5-7 5-7 5 10-15 7-10 7-10 7-10 8 Table 5 Complexity parameters for behavioral model diagrams We perceive each of such diagrams as design point and can sum up the total number of hours required for each to obtain the total size and effort estimate to develop behavioral model. 4.3Data Model Size and Effort Mainly an objective is set to achieve an Entity Relationship diagram to depict the over all database design for the entire software system. E-R diagram itself involves several steps to be carried out. The size of database model itself may relate to the type of software project. Embedded software may not be using any large data base but may work using few files available in the read only memory. Whereas organic and semi detached software projects may require the data to be accessed from large databases. Complexity further increases when database has to be distributed. For the time being we do not discuss about distributed databases and leave it for our future work. Therefore we aim to estimate the size of conventional database to be built. The following table 4 summarizes the parameters that would affect the size of the database. Complexity Ratio No of Entities No of Relationships No of Aggregations Normalization Degree Query Joins Low 10-20 5-10 1-5 1-3 10-15 Medium 20-35 10-20 5-10 1-3 15-25 High 35-50 20-40 10-20 1-5 25-50 Table 6: Complexity parameters and Ratio to develop E-R Model The larger the number of entities to be designed, larger the database size increases. It is time consuming task to identify the persistent objects (i.e. entities) in the system. Then to design its attribute set. Different types of attributes i.e. composite, derived and multi-valued attributes are difficult to design and to decide that which entity would be the best suitable place for any particular attribute. Based upon the complexity ratio we had conducted a survey to know that how much time and personnel is required to build the E-R model. We have analyzed the data and got the average time and no of personnel required to develop E-R model. Complexity Ratio Days Required Personnel Required Low 7 10 1 2 Medium 10 25 1 3 High 25 40 1 5 Table 7: Required Effort for E-R model We have considered the flexibility range in the commencement of the activities as well, therefore have concluded the time and personnel requirement in to range of lower and upper limit. Section 5.Coding phase Size and Effort estimate Much work has been done to focus at the code phase effort and size estimation. Mainly Constructive Cost Model and Use case Point method strive hard to achieve this objective. But still there is room for the refinement. But as our main objective was to talk about the other phases e

My Alignment with the Values of the Bank Essay

According to Business Dictionary 2010, values can be defined as the important and enduring beliefs or ideals shared by the members of a culture about what is desirable and what is not. Each person has his or her own individual values and so does organizations. The values of organizations dictate its actions and behaviors. Corporate values can be said to play an important role in an organization and is imperative to success. And Access Bank PLC is known for its core values which are Excellence, Leadership, Empowered employees, Passion for customers, Professionalism, and Innovation. These values can be said to be responsible for its excellence and continuous strive to be the best both locally and globally. To attain a successful alignment between individual and organization values, there needs to be a synergy between the employee and the organization he or she works for. My alignment with these values are in no doubt because I as an individual always strive to be the best and these values should be cultivated by any individual or organization that strive to be the best. Firstly the value of Leadership, I as an individual that strive for excellence always want to be the leader. I strive to acquire all the necessary knowledge and expertise that makes me stand out as a leader that others look up to. So in this vein, contributing and believing in the Leadership value of Access Bank PLC is something that will come as second nature to me. Then there is excellence. This being part of my daily mantra is a value that aligning with will also come as second nature. I and Access Bank both believe in the value of excellence. As someone who strive to be the best and excel. Excellence is a watch word that applies to everything I do. I recognize the importance

Facts, Fiction and Diversity Secondary Essay Samples

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Profile of Husband Killer Kelly Gissendaner

Kelly Gissendaner received the death penalty after being convicted of being the mastermind behind the murder of her husband, Doug Gissendaner. Prosecutors said Gissendaner  convinced her then-lover, Greg Owens, to commit the murder. Doug Gissendaner Doug Gissendaner was born in December 1966 at Crawford Long Hospital in Atlanta, Georgia. He was the oldest of three children and the only boy. His parents, Doug Sr. and Sue Gissendaner were devoted to their children and raised them to be respectful and responsible. The children grew up in a  happy,  close-knit family. However, unlike his siblings, Doug struggled in school, and it was discovered that he was dyslexic. When he finished high school in 1985, he had grown tired of constantly fighting to pass his grades and decided against his fathers wishes to go to college. Instead, he got a job working with his hands, which is where he always felt most comfortable. Greg Owen Greg Owen was born on March 17, 1971, in Clinton, Georgia. He was the second child of four born to parents Bruce and Myrtis Owen. Their third child, David, died from sudden infant death syndrome a few weeks after his birth in 1976. Greg grew up in a volatile  home filled with alcohol and violence. His parents were constantly moving from one town to another, putting the children in the position of always being newcomers. Friendless throughout much of their childhood, the Owen kids stuck closely together. Greg was a small child and easily intimidated. Belinda was a tough cookie that often stood up against those who  decided to bully  her younger and somewhat frail brother, including Bruce, their father, who violently lashed out at the children when he was drunk. For Greg, going to school was just another place to go to get picked on. He was a loner who struggled to keep his grades up. After managing to complete the eighth grade at age 14, he dropped out and went to work. Kelly Brookshire Kelly Brookshire was born in 1968 in rural Georgia. Her brother, Shane, was born a year later. Unlike the Gissendaners idyllic family, Kellys mother and father, Maxine and Larry Brookshire, liked to drink, do speed and fight. Their marriage ended after four years, partially due to Maxines infidelity. After the divorce, it took Maxine just eight days to marry her lover, Billy Wade. Maxines second marriage played out much the same as her first marriage. There was a lot of alcohol and a lot of fighting. Wade proved to be more  abusive  than Larry and would often lock the kids in their rooms while he beat on Maxine. He also released his ferocious temper onto the children. Throughout the years that Wade was around, he choked Kelly, and both he and Maxine would hit her with belts, flyswatters, their hand and whatever was within reach. But, for Kelly, it was the  mental abuse  that caused the deepest damage. Maxine was so busy dealing with her problems that she offered no support to Kelly when Wade constantly called her stupid and ugly and told her she was unwanted and unloved. As a result, Kelly had no self-esteem and often turned to the one place she could find pleasure; deep into her mind where fantasies of a better life gave her some joy. Abused children often find a feeling of safety at being at school, but for Kelly school was just another problem she could not solve. She was often tired and unable to concentrate and had a difficult time getting through grammar school. Unharmonious Reunion When Kelly was 10 she reunited with her birth father, Larry Brookshire, but the  reunion was a disappointment  to Kelly.  She hoped to establish a father-daughter relationship with Larry, but that did not happen. After his divorce to Maxine, he remarried and had a daughter. There was no attempt on his part to fit Kelly into his new world. New Kid on the Block At about the time that Kelly was entering high school, Maxine decided to divorce Wade and start fresh in a new town. She packed up the kids and moved to Winder, Georgia, a small town located 20 minutes from Athens and an hour from Atlanta. Being a new student in a small town where most of the children grew up knowing each other made it difficult for the six-foot tall Kelly to establish friendships. When other kids were cheering on their team at the high school football games, Kelly would be working the take-out window at the local McDonalds. Maxine had strict rules concerning Kellys social life. She was not allowed to bring friends home, especially boys, and she could not date. Tagged as a loner, Kellys  classmates had little to do with her  and often referred to her as trailer trash. Any friendships that did happen did not last long. That was until her senior year when she met Mitzi Smith. Seeing that Kelly appeared lonely, Mitzi reached out to her, and their friendship flourished. Pregnancy It was also during Kellys senior year that she became pregnant. She was able to hide it for several months, but into her sixth month, Mitzi along with the rest of the school could see that she was an expectant mother. She was subjected to more ridicule by her classmates, but Mitzi stood by her and helped her get through it. Throughout the  pregnancy, Kelly refused to give the name of the babys father. She told Mitzi it could have been either a student or another guy that she knew. Either way, she was not willing to tell the name. When Larry Brookshire found out about Kellys pregnancy he reconnected with her and the two decided that the child should have his last name. In June 1986, just two weeks after Kelly graduated  high school, her son Brandon Brookshire was born. Jeff Banks A few months after Brandon was born, Kelly began dating a boy she knew in high school, Jeff Banks. A few months later they were married. The marriage lasted just six months. It ended abruptly after Larry Brookshire went after Banks with a gun because he failed to pass Larry bread during a family dinner. Now a single mother, 19-year-old Kelly moved herself and her baby back into her mothers mobile home. For the next several  months, life for Kelly continued to be one dramatic episode after another. She was  arrested for shoplifting, physically abused by Larry, was unable to remain employed, and turned to alcohol as a way to  self-medicate. Doug and Kelly Doug Gissendaner and Kelly met in March 1989 through a mutual friend. Doug was instantly attracted to Kelly and the two began dating regularly. He also took an instant liking to Kellys son Brandon. That following September they married. Any reservations Dougs parents had about the marriage was quickly put to rest when they discovered that Kelly was four months pregnant on her wedding day. After the  wedding, Doug and Kelly both lost their jobs and moved in with Kellys mother. It was not long before the bickering and fighting that had plagued Kellys life started up again, only this time it included Doug. But his upbringing did not include knowing how to out scream another family member. He just tried hard not to engage. The Army Wanting a steady income and benefits for his expectant wife, Doug decided to enlist in the Army. There he made a lot of friends and was well respected by his superiors. Being in the Army also allowed Doug enough money to send to Kelly to cover the bills, but Kelly spent the money on other things. When Dougs parents found out that the couples car was about to be  repossessed, they bailed Kelly out and paid the car notes. In August 1990, a month after their first child, Kayla, was born, Doug was shipped to Wiesbaden, Germany and Kelly and the children followed him the following month. Trouble between the two began almost immediately. When Doug was away on Army assignments for days and weeks at a time, Kelly would throw parties, and it was rumored that she was seeing other men. After several confrontations,  Kelly and the children returned to Georgia. When Doug returned home permanently in October 1991, life with Kelly was miserable. A month later Kelly decided to it was her turn to join the Army and Doug decided the marriage was over. They immediately filed for a separation and were finally divorced in May 1993. Doug Sr. and Sue Gissendaner breathed a sigh of relief. Kelly was nothing but trouble. They were glad she was out of their sons life for good. Jonathan Dakota Brookshire (Cody) Kelly and the Army did not get along. She figured her only way out was to get pregnant. By September she got her wish and was back home living with her mother. In November she gave birth to a boy she named Jonathan Dakota but called Cody. The boys father was an Army friend who had cancer and died months before the child was born. Once home Kelly began her usual job hopping and dating multiple men. One job that she landed was at the International Readers League of Atlanta. Her boss was Belinda Owens, and soon the two began socializing together and eventually became best friends. Belinda invited Kelly to her home one weekend, and she introduced her to her brother Owen. There was an immediate attraction between Kelly and Owen, and they became inseparable. A Bad Match Belinda kept a sharp eye over her brother as his relationship with Kelly grew. Things seemed to be great between them at first, but before long Kelly began throwing tantrums and fighting with Greg when he did not do what she wanted. Ultimately Belinda decided that Kelly was not a good match for her brother. She particularly did not like how  she bossed him around. When all of their  fighting  led to a breakup, Belinda felt relief. December 1994 In December 1994, Doug and Kelly rekindled their relationship. They began attending church and working on their poor financial situation. Dougs parents were upset about the reunion and when Doug asked them for money to buy a house they refused. They had already spent thousands of dollars bailing him out of the financial disaster that Kelly had created when they were married. But their opinion failed to sway Doug, and in May 1995 the two were remarried. Doug had his family back together. But by September they were once again separated and Kelly was back seeing Greg Owen. One More Time Whether it was Dougs strong desire to have a  family or his deep love for Kelly, no one can say for sure, but by the beginning of 1996,  Kelly had convinced him  once again to get back together. Doug made a full commitment to the marriage, and to give Kelly the one thing she had always dreamed of having, he got a high-interest loan and bought a small three-bedroom ranch house on Meadow Trace Drive, in a subdivision in Auburn, Georgia. There he did what subdivisions Dads do- he worked on the house, did the yard work, and played with the kids. Kelly, however, filled her spare time focused on something that had nothing to do with her family or her husband. She was back in the arms of Greg Owen. February 8, 1997 Doug and Kelly Gissendaner had been in their new house for three months. On Friday, February 7, Kelly decided to take the children to her mothers house because she was going out for the night with friends from work. Doug spent the evening working on a car over at a friends house. At around 10 p.m. he decided to call it a night and headed home. Saturday he was going to be busy doing some work for the church, and he wanted a good nights sleep. After dinner and an hour spent at a dance club, Kelly told her three friends that she wanted to go home. She said she felt like something bad was going to happen and headed home around midnight. The following morning when Kelly awoke, Doug was not there. She made some calls, including one to his parents, but he was nowhere to be found. By  mid-morning, a missing persons  report  had been filed at the police station. Initial Investigation The initial investigation into Doug Gissendaners whereabouts began on the same day that he was reported as missing. A search group was sent out along the route that he was most likely to have traveled the previous night and statements were taken from family and friends. Kelly Owens was one of the first to talk with the investigators. During that  meeting, she described her marriage to Doug as problem free. But interviews with family members and friends told a different story and one  name, in particular, kept surfacing — Greg Owen. Odd Behavior By Sunday, Dougs car had been located abandoned on a dirt road in Gwinnett County. It had been partially burned from the inside out. On the same day that the burned-out car was found, friends and family gathered in support at Doug Sr. and Sue Gissendaners house. Kelly had also been  there but decided to take the children to the circus. Dougs parents found her behavior as odd for a wife whose husband had just gone missing. The news about the car was not good, but there was still hope that Doug would be found, possibly hurt, but  hopefully not dead. But as more days went by the optimism began to fade. Kelly did a few television interviews and then went back to work the following Tuesday, just four days into the search for her husband. Twelve Days Later It took 12 days to find Doug Gissendaner. His body was discovered a mile from where his car had been found. What looked like a pile of trash ended up to be Doug, dead, on his knees, bent at the waist with his head and shoulders leaning forward and his forehead lying in the dirt. Wild animals had already had an opportunity to  do their damage to his face which was unrecognizable. An  autopsy and dental records  were  necessary to confirm that it was indeed Doug Gissendaner. According to the autopsy, Doug was stabbed four times in the scalp,  neck, and shoulder. Murder Investigation Now with a  murder investigation  to conduct, the list of people to be interviewed grew considerably, with more names added to the list daily. In the meantime, Kelly Gissendaner asked to meet with investigators again to clarify some of what she said  in  her initial statement. She admitted that the marriage had been rocky and during one of their splits, she had been involved with Greg Owen. She said that Greg Owen had threatened to kill Doug when he learned that they were back together and working on their marriage. When asked if she was still in contact with Owen, she said only once in awhile because he called her repeatedly. But all of her candor did little to persuade investigators that she was not somehow  involved in her husbands murder. In the meantime, during Dougs funeral, Kelly showed more bizarre behavior when she had family and friends wait for her arrival for over an hour from the funeral home where the memorial was  given to the cemetery where Doug was to be buried. They found out later that she had stopped for a bite to eat and to do some shopping at the Cracker Barrel. The Alibi As for Greg Owen, he gave detectives a solid alibi. His roommate confirmed what Gret told them, that he had been home the entire night that Doug went missing and had been picked up by a friend at 9 a.m. the following morning for work. The roommate later recanted his story and said Greg had left the apartment the night of the murder and he did not see him again until 8 a.m. the following morning. This was exactly what the detectives needed to get Greg Owen back in for questioning. Greg Owen Cracks With Owens alibi now busted into pieces, he was brought back in for more questioning. Investigator Doug Davis conducted a second interview with Greg on February 24, 1997. Detectives already strongly suspected that Kelly had first-hand knowledge about her husbands murder. Phone records showed that she and Greg Owens talked to each other 47 times during the days before Doug was murdered and, unlike what Kelly had told detectives about Owen constantly calling her, Kelly had initiated the calls 18 times. At  first, Owen refused to answer any questions, but when a  plea deal  was brought to the table stating that he would get life with parole after 25 years, rather than a possible death sentence if he testified against Kelly Gissendaner, he quickly agreed and began confessing to murdering Doug. He told detectives that Kelly planned it all. First, she wanted to make sure that Doug bought the house and that they had moved into for a while before he was killed. She also wanted to secure an alibi on the night of the murder. When Owen asked her why not just divorce Doug, Kelly said he would never leave her alone. He went on to explain that on the night of the murder Kelly picked him up at his apartment, drove to her house, let him inside and provided a nightstick and a knife for Owen to use to attack Doug. She instructed him to make it look like a robbery, then left and went out with her friends while Owen waited in the house for Doug to come home. He said that Doug entered the house around 11 p.m. and Owen  held the knife to his neck, and then made him drive to Luke Edwards Road which is where Kelly told him to go. He then made Doug walk up an embankment and into the woods where he told him to get down on his knees. He struck him over the head with the nightstick and stabbed him, took his wedding ring and a watch, then left him to bleed to death. Next, he drove around in Dougs car until he received a page from Kelly with a code that would indicate that the murder had taken place. She then met Owen at Luke Edwards Road and wanted to see for herself that Doug was dead so she climbed the embankment and viewed his body. Then, with kerosene which Kelly provided, they burned Dougs car. Afterward, they made calls from phone booths at around the same time; then she dropped him off at his home. At that  point, they agreed that they should not be seen together for a while. Kelly Gissendaner Is Arrested Detectives wasted no time in arresting Kelly for the murder of her husband. They went to her home on February 25, well after  midnight made the arrest and then searched the house. This time Kelly had a  new story to tell  to the police. She admitted that she saw Greg Owen the night that Doug was murdered. She went and picked him up after he called her and asked her to meet him and he told her what he did to Doug, and then threatened to do the same to her and her children if she went to the police. The detectives and prosecutor did not believe her story. Kelly Gissendaner was charged with murder, felony murder and possession of a knife during the commission of a felony. She continued to insist that she was  innocent and even turned down a  plea bargain  similar to what Greg Owen received. The Trial With no women on Georgias death row, seeking a death sentence if Gissendaner was found guilty was a risk for prosecutors, but one they decided to take. Kellys trial began on November 2, 1998. She faced a sequestered jury made up of ten women and two men. Television cameras were allowed in the courtroom. She would also be facing Doug Gissendaners father who was permitted to be in the courtroom after he gave his testimony, along with two key witnesses whose testimonies could send her straight to death row. The Witnesses Greg Owens was the states number one witness. Most of his testimony matched his confession although there were some changes. One significant difference referenced the time that Kelly showed up at the murder scene. During court  testimony, he said she was there right as he murdered Doug. He also testified that instead of them  burning Dougs car  together, she tossed a soda bottle of kerosene out of the window and he retrieved and burned the car alone. Next was Laura McDuffie, an inmate that Kelly confided in and who she asked for help in finding a witness who would take the fall for $10,000 and say that she was with Owen, not Kelly, on the night of the murder. She provided McDuffie with a map of her house and a handwritten script of what the witness should say. An expert witness testified that the script was written by Gissendaner. Other witnesses for the prosecution testified about Kellys coldness upon hearing that Doug had been found murdered and about her affair with Greg Owen. One of her closest friends, Pam, testified that after Kelly was arrested, she called Pam and told her that she killed Doug. She called her again and said that Greg Owen forced her to do it by threatening to kill herself and her children. Closing Arguments The prosecutor, George Hutchinson, and Gissendaners defense lawyer, Edwin Wilson, presented strong  closing arguments. The Defense Wilsons argument was that the state had failed to prove Kellys guilt beyond a reasonable doubt. He referred to parts of Greg Owens testimony as unbelievable, pointing out that it did not seem possible that Doug Gissendaner would not fight Owen who was considerably smaller in height and weight. Doug had combat training and had served in a combat theater in Desert Storm. He was trained in escape and evasion, yet he followed Owens instructions to go out the door of his house, and not only get in the car but unlock the passengers side of the car so that Owen could get in. He also found it hard to believe that he would willingly drive to a deserted road, get out of the car and wait while Owen got out on his side, then come around to him, leading him up a hill, into the woods, without once trying to make a run for it or fight for his life. He also pointed out that Greg received a life sentence with the possibility of parole only if he agreed to testify against Gissendaner. He attempted to discredit the testimony of Laura McDuffie, describing her as a hardcore criminal that would do anything to scratch off some of her prison time. And as for Kellys friend, Pam, who testified that the day that Kelly was arrested that she called Pam and told her, I did it, he said she simply did not hear Kelly properly. The Prosecution During Hutchinsons closing argument, he  quickly  pointed out that no one can say what was going through Doug Gissendaner mind when he encountered Owen with a knife inside his home. But the point was that Doug was dead, regardless of the exact chain of events that led to it. As to the attempt to discredit Pams testimony, Hutchinson said Wilson was reinventing and mischaracterizing evidence. And about the credibility of Laura McDuffie, Hutchinson pointed out that what she testified about did not really matter. The evidence was all that the jury needed. The script that handwriting experts testified was written by Kelly and the detailed drawing of the interior of her house backed up the testimony. He referenced the 47 phone calls between Kelly and Greg that took place days before the murder and how that exchange suddenly stopped  afterward, asking the question as to why would that pattern of activity suddenly stop? The Verdict and Sentence In the end, it took the jury two short hours to return a verdict of guilty. During the penalty phase of the trial both sides fought hard, but again, after two hours the jury had made their decision: The state of Georgia versus Kelly Renee Gissendaner, verdict as to sentencing, we the jury find beyond a reasonable doubt that statutory aggravating circumstances do exist in this case. We the jury  fix the sentence of death... Since her conviction, Gissendaner has been incarcerated at Arrendale State Prison, where she is isolated since she is the only woman out of 84 death row inmates. Execution Scheduled Kelly Gissendaner was scheduled to die by lethal injection on February 25, 2015. However, the execution was postponed to March 2, 2015, due to bad weather conditions. Gissendaner exhausted all her appeals which included a 53-page application for clemency with testimonials from a former prison warden, members of the clergy and friends and family. The victims father, Doug Gissendaner, has fought equally hard to make certain that his  ex- daughter-in-laws  sentence is carried out. A statement released by the Gissendaner family after the appeal for clemency was rejected read: â€Å"This has been a long, hard, heartbreaking road for us. Now that this chapter in this nightmare is over, Doug would want us and all of the people who loved him to find peace, to remember all the happy times and cherish memories we have of him. We should all strive every day to be the kind of person he was. Never forget him. Gissendaner Executed September 29, 2015 After multiple eleventh-hour appeals and delays, Kelly Renee Gissendaner, Georgias only woman on death row, was executed by lethal injection, prison officials said. Scheduled to die at 7 p.m. Tuesday, she died by injection of  pentobarbital  at 12:21 a.m. Wednesday. The U.S. Supreme Court denied stays of execution three times Tuesday, Georgias state Supreme Court denied a stay and the Georgia Board of Pardons and Paroles declined to grant her clemency following a hearing at which Gissendaners supporters offered new testimony. Even Pope Francis became involved in the case, requesting mercy for the woman who conspired with her adulterous lover to stab her husband to death in February 1997. Gissendaner was the first woman executed in Georgia in 70 years. Footnotes: The murder occurred on February 7, 1997. Gissendaner was indicted on April 30, 1997, by the Gwinnett County Grand Jury for malice murder and felony murder. The State filed written  notice  of its intent to seek the death penalty on May 6, 1997. Gissendaners trial began on November 2, 1998, and the jury found her guilty of malice murder and felony murder on November 18, 1998. The felony murder conviction was vacated by operation of law. Malcolm v. State, 263 Ga. 369(4), 434 S.E.2d 479 (1993); ?OCGA  § 16-1-7. On November 19, 1998, the jury fixed Gissendaners sentence at death. Gissendaner filed a motion for a new trial on December 16, 1998, which she amended on August 18, 1999, and which was denied on August 27, 1999. Gissendaner filed a notice of appeal on September 24, 1999. This appeal was docketed on November 9, 1999, and orally argued on February 29, 2000. The Supreme Court turned down her appeal on July 5, 2000. The State Board of Pardons and Paroles rejected Gissendaners appeal for clemency on February 25, 2015.