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5.5 Demonstrating the Non-Functional Requirements
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5.5 DEMONSTRATING THE NON-FUNCTIONAL REQUIREMENTS
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The format of the requirements document that we will be presenting to our client was discussed in the previous chapter, and examples are given in Appendix A. The important thing about this document is that it should be understandable to the client. It is built from the basic information in the stories together with some outline ideas of the how the system might look and work. Important non-functional requirements need to be speci ed and clear statements about how these are to be interpreted and tested included. It is no good saying that the system will be fast if we don t say what that means; for example, in a Web-based system this might include the maximum acceptable page download times under suitable conditions, and so forth. Although we have presented the requirements document and the story cards as two separate things, they are very closely related. There will be an interplay between them. We might regard the requirements document as a summary of our current understanding of the overall system, whereas the stories are a more detailed description of individual aspects of its functionality with enough information to allow us to plan, test, and implement each story. The requirements document will have extra and vital information about the proposed system, context statements, assumptions, as well as global quality attributes and non-functional requirements. It is these that we turn to next.
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Non-Functional Requirements
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A non-functional requirement either describes how well the system should perform (a quality attribute) or a constraint or limit that the system must adhere to (a resource attribute). The non-functional requirements were de ned in 4, and can be split into categories like reliability, usability, ef ciency, maintainability and portability, etc. Here we give some example statements that might be part of the requirements document. 5.5.1.1 Reliability
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For a single user, the system should crash no more than once per 10 hours. The system should produce the correct values for any mathematical expression 100% of the time. If the system crashes, it should behave perfectly normally when loaded up again with minimal data loss. 5.5.1.2 Usability
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A user should be able to add a new customer to the system within 1 minute. A user should be able to add a new order to the system within 1 minute.
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5 Identifying Stories and Preparing to Build
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A user should be able to edit a customer s details within 5 minutes (will vary with details type). A user should be able to produce reports and statistics within 1 minute.
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Ef ciency
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The system should load up within 15 seconds. The time taken for the system to retrieve data from the server should never exceed 30 seconds.
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The system should be designed in such a way that makes it easy to be modi ed in the future. The system should be designed in such a way that makes it easy to be tested.
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The client system should work on the client s current computer network, which is connected to the Internet and has Windows XP or better. The system should be easy to install. These statements need to be re ned into a more precise statement in order to make them testable. What, for example, does easy to install mean We will look at this in the next chapter. From each story that we have discussed with the client, we extract the key functional details. These are grouped in sections with other story lines that are clearly related. These requirements are categorized on the basis of which are mandatory, desirable, and optional. To do this, we need to have an estimate of the time we might take to complete these, and this will help us to make these decisions. The next section looks at the process of trying to estimate this. Naturally, we must consult the client on which he or she thinks are mandatory and so forth. We have to be realistic, and you must not promise to do more than you can achieve in the time given.
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