# Module 11. Software Project Planning. Version 2 CSE IIT, Kharagpur

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1 Module 11 Software Project Planning

2 Lesson 29 Staffing Level Estimation and Scheduling

3 Specific Instructional Objectives At the end of this lesson the student would be able to: Identify why careful planning of staffing pattern for a project is so important. Determine numerically how change of project duration affects the overall effort and cost. Identify five necessary tasks taken by a project manager in order to perform project scheduling. Explain the usefulness of work breakdown structure. Explain activity networks and critical path method. Develop the Gantt chart for a project. Develop PERT chart for a project. Staffing level estimation Once the effort required to develop a software has been determined, it is necessary to determine the staffing requirement for the project. Putnam first studied the problem of what should be a proper staffing pattern for software projects. He extended the work of Norden who had earlier investigated the staffing pattern of research and development (R&D) type of projects. In order to appreciate the staffing pattern of software projects, Norden s and Putnam s results must be understood. Norden s Work Norden studied the staffing patterns of several R & D projects. He found that the staffing pattern can be approximated by the Rayleigh distribution curve (as shown in fig. 11.6). Norden represented the Rayleigh curve by the following equation: E = K/t² d * t * e -t² / 2 t² d Where E is the effort required at time t. E is an indication of the number of engineers (or the staffing level) at any particular time during the duration of the project, K is the area under the curve, and t d is the time at which the curve attains its maximum value. It must be remembered that the results of Norden are applicable to general R & D projects and were not meant to model the staffing pattern of software development projects.

4 Effort per Unit Time t d Time Fig. 11.6: Rayleigh curve Putnam s Work Putnam studied the problem of staffing of software projects and found that the software development has characteristics very similar to other R & D projects studied by Norden and that the Rayleigh-Norden curve can be used to relate the number of delivered lines of code to the effort and the time required to develop the project. By analyzing a large number of army projects, Putnam derived the following expression: L = C k K 1/3 t d 4/3 The various terms of this expression are as follows: K is the total effort expended (in PM) in the product development and L is the product size in KLOC. t d corresponds to the time of system and integration testing. Therefore, t d can be approximately considered as the time required to develop the software.

5 C k is the state of technology constant and reflects constraints that impede the progress of the programmer. Typical values of C k = 2 for poor development environment (no methodology, poor documentation, and review, etc.), C k = 8 for good software development environment (software engineering principles are adhered to), C k = 11 for an excellent environment (in addition to following software engineering principles, automated tools and techniques are used). The exact value of C k for a specific project can be computed from the historical data of the organization developing it. Putnam suggested that optimal staff build-up on a project should follow the Rayleigh curve. Only a small number of engineers are needed at the beginning of a project to carry out planning and specification tasks. As the project progresses and more detailed work is required, the number of engineers reaches a peak. After implementation and unit testing, the number of project staff falls. However, the staff build-up should not be carried out in large installments. The team size should either be increased or decreased slowly whenever required to match the Rayleigh-Norden curve. Experience shows that a very rapid build up of project staff any time during the project development correlates with schedule slippage. It should be clear that a constant level of manpower through out the project duration would lead to wastage of effort and increase the time and effort required to develop the product. If a constant number of engineers are used over all the phases of a project, some phases would be overstaffed and the other phases would be understaffed causing inefficient use of manpower, leading to schedule slippage and increase in cost. Effect of schedule change on cost By analyzing a large number of army projects, Putnam derived the following expression: L = CkK1/3td4/3 Where, K is the total effort expended (in PM) in the product development and L is the product size in KLOC, t d corresponds to the time of system and integration testing and C k is the state of technology constant and reflects constraints that impede the progress of the programmer Now by using the above expression it is obtained that, 3 K = L /Ck 3 t d 4 Or,

6 K = C/t d 4 3 For the same product size, C = L / Ck 3 is a constant. or, K 1/K 2 = t d2 4 /td1 4 or, K 1/t d 4 or, cost 1/t d (as project development effort is equally proportional to project development cost) From the above expression, it can be easily observed that when the schedule of a project is compressed, the required development effort as well as project development cost increases in proportion to the fourth power of the degree of compression. It means that a relatively small compression in delivery schedule can result in substantial penalty of human effort as well as development cost. For example, if the estimated development time is 1 year, then in order to develop the product in 6 months, the total effort required to develop the product (and hence the project cost) increases 16 times. Project scheduling Project-task scheduling is an important project planning activity. It involves deciding which tasks would be taken up when. In order to schedule the project activities, a software project manager needs to do the following: 1. Identify all the tasks needed to complete the project. 2. Break down large tasks into small activities. 3. Determine the dependency among different activities. 4. Establish the most likely estimates for the time durations necessary to complete the activities. 5. Allocate resources to activities. 6. Plan the starting and ending dates for various activities. 7. Determine the critical path. A critical path is the chain of activities that determines the duration of the project. The first step in scheduling a software project involves identifying all the tasks necessary to complete the project. A good knowledge of the intricacies of the project and the development process helps the managers to effectively identify the important tasks of the project. Next, the large tasks are broken down into a logical set of small activities which would be assigned to different engineers. The work breakdown structure formalism helps the manager to breakdown the tasks systematically.

8 Fig. 11.7: Work breakdown structure of an MIS problem Activity networks and critical path method WBS representation of a project is transformed into an activity network by representing activities identified in WBS along with their interdependencies. An activity network shows the different activities making up a project, their estimated durations, and interdependencies (as shown in fig. 11.8). Each activity is represented by a rectangular node and the duration of the activity is shown alongside each task. Managers can estimate the time durations for the different tasks in several ways. One possibility is that they can empirically assign durations to different tasks. This however is not a good idea, because software engineers often resent such unilateral decisions. A possible alternative is to let engineer himself estimate the time for an activity he can assigned to. However, some managers prefer to estimate the time for various activities themselves. Many managers believe that an aggressive schedule motivates the engineers to do a better and faster job. However, careful experiments have shown that unrealistically aggressive schedules not only cause engineers to compromise on intangible quality aspects, but also are a cause for schedule delays. A good way to achieve accurately in estimation of the task durations without creating undue schedule pressures is to have people set their own schedules.

10 Integrate and test Write user manual The critical paths are all the paths whose duration equals MT. The critical path in fig is shown with a blue arrow. Gantt chart Gantt charts are mainly used to allocate resources to activities. The resources allocated to activities include staff, hardware, and software. Gantt charts (named after its developer Henry Gantt) are useful for resource planning. A Gantt chart is a special type of bar chart where each bar represents an activity. The bars are drawn along a time line. The length of each bar is proportional to the duration of time planned for the corresponding activity. Gantt charts are used in software project management are actually an enhanced version of the standard Gantt charts. In the Gantt charts used for software project management, each bar consists of a white part and a shaded part. The shaded part of the bar shows the length of time each task is estimated to take. The white part shows the slack time, that is, the latest time by which a task must be finished. A Gantt chart representation for the MIS problem of fig is shown in the fig Fig. 11.9: Gantt chart representation of the MIS problem

11 PERT chart PERT (Project Evaluation and Review Technique) charts consist of a network of boxes and arrows. The boxes represent activities and the arrows represent task dependencies. PERT chart represents the statistical variations in the project estimates assuming a normal distribution. Thus, in a PERT chart instead of making a single estimate for each task, pessimistic, likely, and optimistic estimates are made. The boxes of PERT charts are usually annotated with the pessimistic, likely, and optimistic estimates for every task. Since all possible completion times between the minimum and maximum duration for every task has to be considered, there are not one but many critical paths, depending on the permutations of the estimates for each task. This makes critical path analysis in PERT charts very complex. A critical path in a PERT chart is shown by using thicker arrows. The PERT chart representation of the MIS problem of fig is shown in fig PERT charts are a more sophisticated form of activity chart. In activity diagrams only the estimated task durations are represented. Since, the actual durations might vary from the estimated durations, the utility of the activity diagrams are limited. Gantt chart representation of a project schedule is helpful in planning the utilization of resources, while PERT chart is useful for monitoring the timely progress of activities. Also, it is easier to identify parallel activities in a project using a PERT chart. Project managers need to identify the parallel activities in a project for assignment to different engineers. Fig : PERT chart representation of the MIS problem

12 The following questions have been designed to test the objectives identified for this module: 1. List the major responsibilities of a software project manager. 2. What should be the necessary skills of a software project manager in order to perform the task of software project management? 3. When does the software planning activity start and end in software life cycle? List some important activities that a software project manager performs during software project planning. 4. What are the project related estimates performed by a project manager and also mention the order of project related estimates. 5. What do you understand by Sliding Window Planning? Explain using a few examples the types of projects for which this form of planning is especially suitable. What are its advantages over conventional planning? 6. List the important items that a Software Project Management Plan (SPMP) document should discuss. 7. Point out the major shortcomings of Lines of Code (LOC) metric in order to use it as a software project size metric. 8. List out the major shortcomings of function point metric in order to use it as a software project size metric. 9. What is the necessity of a feature point metric in the context of software project size estimation? 10. Write down the major differences in between empirical estimation technique and heuristic technique. 11. How are the software project related parameters such as program length, program vocabulary, program volume, potential minimum volume, effort to develop the project, project development time estimated using analytical estimation technique? 12. Write down the major differences between expert judgment technique and delphi cost estimation technique. 13. Write down the differences among organic, semidetached and embedded software product. 14. Differentiate among basic COCOMO model, intermediate COCOMO model and complete COCOMO model. 15. As the manager of a software project to develop a product for business application, if you estimate the effort required for completion of the project to be 50 person-months, can you complete the project by employing 50 engineers for a period of one month? Justify your answer.

13 16. For the same number of lines of code and the same development team size, rank the following software projects in order of their estimated development time. Show reasons behind your answer. A text editor An employee pay roll system An operating system for a new computer 17. Explain Norden s model in the context of staffing requirements for a software project. 18. Explain how can Putnam s model be used to compute the change in project cost with project duration. What are the main disadvantages of using Putnam s model to compute the additional costs incurred due to schedule compression? How can you overcome them? 19. Explain why adding more manpower to an already late project makes it later. 20. Suppose you have estimated the normal development time of a moderate-sized software product to be 5 months. You have also estimated that it will cost Rs. 50,000/- to develop the software product. Now, the customer comes and tells you that he wants you to accelerate the delivery time by 10%. How much additional cost would you charge the customer for this accelerated delivery? Irrespective of whether you take less time or more time to develop the product, you are essentially developing the same product. Why then does the effort depend on the duration over which you develop the product? 21. How does the change of project duration affect the overall project development effort and development cost? 22. Write down the necessary tasks performed by a project manager in order to perform project scheduling. 23. Write down the major differences between work breakdown structure and activity network model. 24. Explain critical path method. 25. Explain when you should use PERT charts and when you should use Gantt charts while you are performing the duties of a project manager.

14 Mark all options which are true. 1. Normally software project planning activity is undertaken before the development starts to plan the activities to be undertaken during development once the development activities start after the completion of the project monitoring and control none of the above 2. Which of the following estimation is carried out first by a project manager during project planning? estimation of cost estimation of the duration of the project project size estimation estimation of development effort 3. Sliding Window Planning involves planning a project before development starts planning progressively as development proceeds planning a project after development starts none of the above 4. A project estimation technique based on making an educated guess of the project parameters (such as project size, effort required to develop the software, project duration, cost etc.) is analytical estimation technique heuristic estimation technique empirical estimation technique none of the above 5. An example of single variable heuristic cost estimation model is Halstead s software science basic COCOMO model intermediate COCOMO model complete COCOMO model 6. Operating systems and real-time system programs can be considered as application programs utility programs system programs none of the above

15 7. Compilers, linkers, etc. can be considered as application programs utility programs system programs none of the above 8. Data processing programs are considered as utility programs system programs application programs none of the above 9. During project scheduling, resource allocation to different activities is done using which of the following representations? PERT chart activity network representation work breakdown structure Gantt chart Mark the following as either True or False. Justify your answer. 1. Size of a project, as used in COCOMO is the size of the final executable code in bytes. 2. According to the COCOMO model, cost is the fundamental attribute of a software product, based on which size and effort are estimated. 3. If we increase the size of a software product by two times then the time required to develop that software product would be double. 4. The number of development personnel required for any software development project can be obtained by dividing the total (estimated) effort by the total (estimated) duration of the project. 5. For the development of the same product, the larger is the size of a software development team, the faster is the product development. (for simplicity, assume that all engineers are equally proficient and have exactly similar experience). 6. As a project manager it would be worthwhile on your part to reduce the project duration by half provided the customer agrees to pay for the increased manpower requirements. 7. PERT charts are a sophisticated form of activity chart.

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