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Example text
This criticism can be valid if the SDLC phases are followed too rigidly. However, adjacent phases usually interact, as shown by the dotted lines in Figure 1-25 on the next page, and interaction among several phases is not uncommon. Other analysts regard the waterfall model as a two-way water flow model, with emphasis on iteration and user input. Used in this manner, the traditional model is not as different from agile methods as it might appear to be. The SDLC model usually includes five steps, which are described in the following sections: systems planning, systems analysis, systems design, systems implementation, and systems support and security.
If you use an O-O methodology, follow a logical series of steps as you define the components. If you use agile methods, set the ground rules and be sure they are understood clearly. Involve Users and Listen Carefully to Them Ensure that users are involved in the development process, especially when identifying and modeling system requirements. Modeling and prototyping can help you understand user needs and develop a better system. When you interact with users, put aside any preconceived notions and listen closely to what they are saying.
For example, a truck fleet dispatcher might run a series of what-if scenarios to determine the impact of increased shipments or bad weather. Alternatively, a retailer might use what-if analysis to determine the price it must charge to increase profits by a specific amount while volume and costs remain unchanged. FIGURE 1-18 Retailers use RFID tags for security and inventory control. com/sad8e/ more, locate Chapter 1, and then click the Knowledge Management Systems link. Knowledge management systems are called expert systems because they simulate human reasoning by combining a knowledge base and inference rules that determine how the knowledge is applied.