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None of the use cases were written in detail; rather, 10-20% should be writ ten in detail to obtain some realistic insight into the scope of the problem. 39 Chapter 5 UNDERSTANDING REQUIREMENTS Fast, Cheap, Good: Choose any two. —anonymous Objectives • Define the FURPS+ model. • Relate types of requirements to UP artifacts. Introduction Not all requirements are created equal. This chapter introduces the FURPS+ requirements categories. Requirements are capabilities and conditions to which the system—and more broadly, the project—must conform [JBR99].

It interfaces to various service applications, such as a third-party tax calculator and inventory control. These systems must be relatively fault-tolerant; that is, even if remote services are temporarily unavailable (such as the inventory system), they must still be capable 29 3 - CASE STUDY: THE NEXTGEN POS SYSTEM of capturing sales and handling at least cash payments (so that the business is not crippled). A POS system increasingly must support multiple and varied client-side terminals and interfaces.

1 Types of Requirements In the UP, requirements are categorized according to the FURPS+ model [Grady92], a useful mnemonic with the following meaning:1 • Functional—features, capabilities, security. • Usability—human factors, help, documentation. • Reliability—frequency of failure, recoverability, predictability. 1. There are several systems of requirements categorization and quality attributes published in books and by standards organizations, such as ISO 9126 (which is similar to the FURPS+ list), and several from the Software Engineering Institute (SE1); any can be used on a UP project.

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