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TYPICAL DOCUMENTS
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Statement of work Preliminary description of desired capabilities, often produced by the user. Software requirements speci cation Describes what the nished software will do. Object model Shows main objects/classes.
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1.1.2.1 1.1.2.2
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CHAPTER 1 The Software Life Cycle
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Use case scenarios Show sequences of possible behaviors from the user s viewpoint.
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Project schedule Describes the order of tasks and estimates of time and e ort necessary. Software test plan Describes how the software will be tested to ensure proper behavior. Acceptance tests Tests designated by the customer to determine acceptability of the system. Software design Describes the structure of the software. Architectural design The high-level structure with the interconnections. Detailed design The design of low-level modules or objects. Software quality assurance plan (SQA plan) Describes the activities that will be done to ensure quality. User manual Describes how to use the nished software. Source code The actual product code. Test report Describes what tests were done and how the system behaved. Defect report Describes dissatisfaction of the customer with speci c behavior of the system; usually, these are software failures or errors.
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Software Life Cycle Models
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The four di erent software life cycle models presented in the following sections are the most common software life cycle models.
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1.2.1 THE LINEAR SEQUENTIAL MODEL
This model, shown in Fig. 1-1, is also called the waterfall model, since the typical diagram looks like a series of cascades. First described by Royce in 1970, it was the rst realization of a standard sequence of tasks. There are many versions of the waterfall model. Although the speci c development tasks will occur in almost every development, there are many ways to divide them into phases. Note that in this version of the waterfall, the project planning
Feasibility Requirements
CHAPTER 1 The Software Life Cycle
Design
Implementation
Testing
Fig. 1-1. Waterfall model.
activities are included in the requirements phase. Similarly, the delivery and maintenance phases have been left o .
THE PROTOTYPING MODEL
This software life cycle model builds a throwaway version (or prototype). This prototype is intended to test concepts and the requirements. The prototype will be used to demonstrate the proposed behavior to the customers. After agreement from the customer, then the software development usually follows the same phases as the linear sequential model. The e ort spent on the prototype usually pays for itself by not developing unnecessary features.
INCREMENTAL MODEL
D. L. Parnas proposed the incremental model.1 The goal was to design and deliver to the customer a minimal subset of the whole system that was still a useful system. The process will continue to iterate through the whole life cycle with additional minimal increments. The advantages include giving the customer a working system early and working increments.
BOEHM S SPIRAL MODEL
B. Boehm introduced the spiral model.2 The image of the model is a spiral that starts in the middle and continually revisits the basic tasks of customer communication, planning, risk analysis, engineering, construction and release, and customer evaluation.
D. Parnas. Designing Software for Ease of Extension and Contraction. IEEE Transactions on Software Engineering (TOSE) 5:3, March 1979, 128 138. B. Boehm.. A Spiral Model for Software Development and Enhancement. IEEE Computer. 21:5, May 1988, 61 72.
CHAPTER 1 The Software Life Cycle
Review Questions
1. How does a phased life cycle model assist software management 2. What are two required characteristics of a milestone 3. For each of the following documents, indicate in which phase(s) of the software life cycle it is produced: nal 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, test report, documentation. 4. Order the following tasks in terms of the waterfall model: acceptance testing, project planning, unit testing, requirements review, cost estimating, high-level design, market analysis, low-level design, systems testing, design review, implementation, requirement speci cation. 5. Draw a diagram that represents an iterative life cycle model.
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