Identifying Stories and Preparing to Build in .NET

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5 Identifying Stories and Preparing to Build
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The next section details some simple techniques for thinking about system tests. The basic idea has been used in industrial settings and has seen massive improvements (up to 300%) in the effectiveness of the tests compared with the original test method being used.
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COLLECTIONS OF STORIES
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The task of taking the list of functional requirements or stories and identifying and organizing them into a coherent system can be achieved using the technique that we will describe next. To gain a greater understanding of how all the stories t together into a coherent system, we need to think about how they relate to each other. For example, it may be that one story can only occur after another one has occurred, or it might be that at some point in the business cycle there is a choice between several stories. In Fig. 5.7 the initial story, story 0, is followed by either story 1 or story 2 (but not both at the same time) and then either story 1 is followed by story 2 or story 3 is followed by story 4. It might be, then, that stories 2 and 4 are succeeded by further stories or the system returns back to the initial story. In many cases, each main story is associated with a user interface screen, there may be a whole screen to a given story, or there may be many stories that can be driven from that screen. Although it is too early to plan out the detailed graphics of the screen, it is still important to identify the key elements of the screen, the components that can be used by the user to instigate the process de ned by a story, the extra information needed to be displayed for this, and the result of the operation of the story displayed suitably. We might break down a story into tasks that, when combined, provide a natural way to implement the story. One task might be to paint a screen (e.g., a form), another might be to provide a data entry function that will connect to a task that performs some calculation with the data. This might involve communicating with a database to check with current data, and then to communicate the result back to the screen. Once these tasks have been programmed and integrated together, we have a coherent story to show the client. It is sometimes a good idea to show the client some of your thoughts, on paper, of how the story relates to your interface ideas before you do much coding. This can then lead to a clearer understanding of what is required.
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Figure 5.7 Collections of stories.
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5.2 Collections of Stories
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The system will respond to some external stimuli: these will be, for example, users interacting with a screen entering data; choosing options through mouse clicks, ticking boxes, and so on; messages from some other system; perhaps the results of a query to a database. This data is then processed in some way; perhaps it s just a simple calculation, perhaps the system needs to contact another part of the system (e.g., a database) in order to proceed. The results of the computation may then be fed back to the user via a screen or output in some other way or to another component. It is possible that the database needs to be updated as a result of this interaction. Thus we have four essential actors in any system: an input actor, a processing actor, a memory actor, and an output actor. The memory actor this could be managing a database will be involved in reading and writing to the notional memory and communicating with the other actors. The input actor reads the input from the screen or input device, the output actor deals with the output, while the processing actor does the actual core computation. We conclude this section with some examples of stories.
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