Getting Technical in .NET framework

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4.7 Getting Technical
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Figure 4.6 Simple mind map showing the F-net users.
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There are other techniques that can be used in certain circumstances: Card sorting: useful if you want to understand the user s classi cation of his or her knowledge domain; Carrying out a user role yourself. Consult a good book of requirements elicitation, for example, Hull (2002).
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PUTTING YOUR KNOWLEDGE TOGETHER
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Gathering all this information is one thing, but putting it all together into a coherent model of the business is quite another. There are no simple solutions to this problem. In general, common sense is the best approach; however, a simple but effective way to gather a lot of disparate information into a coherent and structured whole is to use mind maps (Fig. 4.6). See http://www.freemind.org for a useful tool.
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GETTING TECHNICAL
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In this phase, we need to think about the system and how it relates to its business environment, its users, and so on. We will do this in a number of stages. Some of these are outlined below. In traditional software development approaches, this phase is lengthy and tends to be in exible. For example, we could envisage the following sequence of events, with many iterations of this basic approach, each time identifying more of the required system (Fig. 4.7). 1. Identify business objects: de ne all external observable relevant business objects. We need to look at the sorts of things that are coherent entities in the part of the business we are considering. These could include products, contracts, orders, invoices, and such like. Make a proper list of them and try to distinguish between those that are involved with the external activities of the business
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Figure 4.7 Basic stages in business analysis and system identi cation.
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(e.g., objects that are apparent to the customers, agents, and suppliers of the business) and those involved in the monitoring of the company (such as taxation and other government authorities) and the objects that are de ned for the convenience of the internal management of the company (these might be internal orders, memos and planning material, records and archives of company activity, etc.). Many of these objects will relate to aspects of the databases that will be used to support the system activity. 2. Link the business objects to business processes: evaluate the ow and content of relevant information in the business. Each business process will involve a number of individual processes that take place in an organized way. What is the order in which this information is processed, what type of information is it Try to get a general picture of what happens and when during typical scenarios of business activity. You will refer to the business objects described above; if you come across one that has not been identi ed previously, then it needs to be added to the list. Equally, if you found an object that doesn t seem to feature in any process that you are analyzing, eliminate it. It may be that you nd some dif culty in modeling things at the right level; there is always the temptation to try to describe things in too much detail. Try to avoid this at this stage. We are looking for a rather broad-brush description of what is going on. 3. Identify all relevant software functions. Now we can start imagining what our software is going to do. It might be replacing some existing function, either a manual operation or in some obsolete software, or it might be a new feature that has not been implemented with software before. We will come back to this process in 6; at the moment, it suf ces to write it down as clearly and concisely as possible. 4. Identify the business event triggers: understand the relevant business behavior (events). Now we have to try to gure out how these things actually relate to each other. We should try to de ne some common scenarios that explain the overall operation of the business processes through the medium of identifying the events that cause the scenario to operate. These could be the placing of an order by a customer; here we might need to identify what sort of customer is involved, a new or existing one, trade or retail. The business process involved for each of these may be different, and so the system will be expected to behave differently as well.
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