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Answers to Review Questions
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1. How does a phased life cycle model assist software management The phased life cycle improves the visibility of the project. The project can be managed by using the phases as milestones. More detailed phases will allow closer monitoring of progress. 2. What are the two required characteristics of a milestone A milestone (1) must be related to progress in the software development and (2) must be obvious when it has been accomplished. 3. Documents in the software life cycle: Final user manual Architectural design SQA plan Module speci cation Source code Statement of work Test plan Preliminary user manual Detailed design Cost estimate Project plan Implementation phase Design phase Project planning phase Design phase Implementation phase Feasibility phase Requirements phase Requirements phase Design phase Project planning phase Project planning phase
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Test report Documentation 4. Order of tasks:
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CHAPTER 1 The Software Life Cycle
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Market analysis Project planning, cost estimating, requirement speci cation (may be done concurrently) Requirements review High-level design Low-level design Design review Implementation Unit testing Systems testing Acceptance testing 5. Draw a diagram that represents an iterative life cycle model. See Fig. 1-2.
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Fig. 1-2.
Iterative life cycle model.
Software Process and Other Models
A software process model (SPM) describes the processes that are done to achieve software development. A software process model usually includes the following:     Tasks Artifacts ( les, data, etc.) Actors Decisions (optional)
The notations used can vary. The standard software process model uses ovals for tasks and processes. The artifacts are represented by rectangles and the actors by stick gures. Many software process models do not include decisions. We will use diamonds whenever we show decisions. The ow is shown by arcs and is usually left-to-right and top-down. Arcs are normally not labeled. The following are rules and interpretations for correct process models:  Two tasks cannot be connected by an arc. Tasks must be separated by artifacts.  A task is not executable until its input artifacts exist.  There are one or more start tasks and one or more terminal tasks.  All tasks must be reachable from the start task.  There is a path from every task to the terminal task. Software process models can be descriptive; that is, they can describe what has happened in a development project. The descriptive model is often created as part of a postmortem analysis of a project. This can be useful in terms of identifying problems in the software development process. Or, software process models can be
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The Software Process Model
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CHAPTER 2 Software Process and Other Models
prescriptive; that is, the software process model can describe what is supposed to happen. Prescriptive software process models can be used to describe the standard software development process. These can be used as training tools for new hires, for reference for uncommon occurrences, and for documenting what is supposed to be happening.
EXAMPLE 2.1
Figure 2-1 is a process model for unit testing software. There are two actors: the tester and the team leader. The unit tester, of course, is responsible for the unit testing. The unit tester uses the source code and the test plan to accomplish the unit testing. The result of this activity is an artifact, the test results. The team leader reviews the test results, and the result of this activity should be the approval of the unit testing. This model does not explicitly show what happens when the process is not successful. It could be inferred that the unit tester keeps testing until he or she is happy. Similarly, if the team leader is not ready to give the approval, then the process may be backed up to redo the unit testing.
Unit tester Team leader
Source code Unit testing Test plan Test results Test review Approval
Fig. 2-1.
Process diagram for unit testing.
EXAMPLE 2.2
Draw the process model showing decisions. Adding decisions allows the process model to be more explicit about what happens in all circumstances, as shown in Fig. 2-2.
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