Chapter 14. Sample Application: Detailed Design
We are now ready to begin the detailed design of the Lexington Brokerage application (introduced in Chapter 7). To get early user feedback to validate our basic design decisions, we decide to do an initial design of the most critical parts of the system and to do a usability test using a Wizard of Oz setup. We plan to create enough of the design so that callers can log in, get quotes, and make trades. Once the initial design is validated, we will flesh out the remainder of the design in complete detail.
Call Flow Design
We start by creating a high-level call flow of the entire system (see Figure 14-1). The call flow shows the basic architecture of the dialog. The major components of the system are ...
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