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1. What is the distinction between a WBS and a process model A process model describes the software activities in a generic sense, that is, for many di erent projects. It describes the process, the artifacts produced and used, and the actors responsible for the activities. A process model is a graph; it can have cycles and so on. A work breakdown structure is a tree that expands the process model s activities with details and necessary subtasks that are speci c for a particular project. A WBS task that appears in every project should also be in the process model. 2. Why should a WBS be a tree
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CHAPTER 4 Software Project Planning
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If there are loops in a WBS, it means that some task recursively depends on itself, which is impossible. A loop will normally happen when some task is not de ned properly. If there are two paths to a task, it normally means that two di erent higher-level tasks depend on that common subtask. It only needs to be shown (and done) once. 3. What happens when there is not a completion criterion for a task in a WBS It means that it will not be clear if progress is being made or when it is done. It also may mean that it is not clear what actually needs to be done. For example, a subtask such as research XXX is not well speci ed. There should be a goal to the research and that should be clearly stated in the task description. 4. What is the advantage of using a PERT diagram Although the WBS will develop a list of tasks, it may be di cult to see which tasks have to be done rst and which tasks will determine the nal completion time. These tasks are on the critical path. 5. Why does delaying a task on the critical path delay the whole project The critical path is de ned as the set of tasks that determine the minimum time for completing the project. Practically, if a task is on the critical path and it is delayed, that means the start time and ending time of the next task on the critical path will be delayed. This will ripple down to the last task on the critical path, and the project will be delayed. 6. Is the critical path important if only one person is working on a project It is important only if all tasks are on the critical path. If there are tasks not on the critical path and those tasks cannot be done in parallel since there is only one person, the time required for those tasks will have the be added to the time of the critical path to determine the completion time. 7. What is the importance of slack time Although tasks not on the critical path do not determine the minimal completion time, if those tasks are not done in a timely fashion, the completion time will be delayed. The slack time shows the range of time in which that task must be completed. 8. Why is slack time based on the earliest of the latest start times of the successor tasks Slack time is based on the earliest such start time because if that task was delayed past that start time, that task would not be completed in time and the ripple e ect would delay the whole project. 9. Draw a diagram that shows economy of scale and diseconomy of scale. Label the diagram and explain which is which. A line that curves upward shows a diseconomy of scale. That is, with bigger projects, the cost per unit of size increases. A line that curves downward shows an economy of scale. That is, the bigger the project, the cheaper the cost per unit of size. See Fig. 4-4.
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