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corrected.
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APPRENDIX B PROJECT MANAGEMENT CONSIDERATIONS
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Advantages of the Waterfall Method
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The main advantages of the Waterfall method are its simplicity and the fact that everything is documented and agreed upon with the customer. This leads to some important benefits: Because everything is planned from the start, it s easy for the project manager to correctly estimate project costs and timelines. The rigorous initial planning makes the project goals clear. All requirements are analyzed and validated by the customer, so the customer can estimate the benefits incurred by the software application before it s actually implemented.
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Disadvantages of the Waterfall Method
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The disadvantages of the Waterfall method are The customer is not able to see the product until it s completely finished. At that stage, it can be very expensive to make any changes to the project. It has little flexibility for scope changes during the project s development. The architecture limitations are often not discovered until late in the development cycle. Because testing happens at the end of the Coding phase, unexpected problems with the code might force developers to find quick fixes at the expense of the planned architecture. The Waterfall method doesn t work on projects whose requirements can t be rigorously planned from the start.
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The Spiral Method
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As a development of the Waterfall method, the Spiral method is more suitable for large, expensive, and complicated projects. Barry Boehm first described it in 1988 as an iterative waterfall in which every iteration provides increased software capability (see Figure B-2, which represents the diagram created by Barry Boehm). The diagram consists of a spiral divided into four quadrants. Each quadrant represents a management process: Identify, Design, Construct, and Evaluate. The system goes through four cycles of these four processes: Proof-of-concept cycle: Define the business goals, capture the requirements, develop a conceptual design, construct a proof-of-concept, establish test plans, and conduct a risk analysis. Share results with user. First-build cycle: Derive system requirements, develop logic design, construct first build, and evaluate results. Share results with user. Second-build cycle: Derive subsystem requirements, produce physical design, construct second build, and evaluate results. Share results with user.
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APPENDIX B PROJECT MANAGEMENT CONSIDERATIONS
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Final-build cycle: Derive unit requirements, produce final design, construct final build, and test all levels. Seek user acceptance.
Figure B-2. The Spiral model The main advantages of the Spiral method proposed by Boehm are The entire application is built on working with the client. Any gaps in the Requirement phase of the Waterfall method are identified as work progresses. The spiral representation conveys very clearly the cyclic nature of the project and the progression through its lifespan.
APPRENDIX B PROJECT MANAGEMENT CONSIDERATIONS
However, the Spiral method has some disadvantages as well: Requires serious discipline on the part of the client. Executive control can be difficult because in most projects, the client is not responsible for the schedule and budget.
Note The Spiral method is more suitable for software in which the entire problem is well defined from
the start, such as modeling and simulating software.
The Rapid Application Development (RAD) Method
RAD is another common project-management method that is, in essence, try before you buy. Whereas in the Waterfall and even Spiral methods, the client was working with a lot of documentation, in the RAD approach, the client works with the software as it s being developed. The belief is that the client can produce better feedback when working with a live system as opposed to working strictly with documentation. When using RAD as a projectmanagement method, customer rejection cases are significantly less when going into production. The RAD method consists of the following phases: Business modeling Data modeling Process modeling Application generation Testing and turnover The RAD approach allows rapid generation and change of UI features. The client works with the software just like in the production environment. The main disadvantage of RAD is that the client will always want more enhancements to the software not always important ones and the developer must try to satisfy the client s needs. This can result in an unending cycle of requirements, going away from the main purpose of the project.
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