DEVELOPING THE REQUIREMENTS DOCUMENTS in .NET

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4.8 DEVELOPING THE REQUIREMENTS DOCUMENTS
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A collection of requirements notes can be produced that can help to organize one s thoughts into a more structured form. The aim is to produce a detailed list of requirements that provides a basis for early planning and approval. The notes should lead to a clear description of the client s background and their objectives. Here are some examples from the F-net project. The functional requirements should be stated, eventually, in a tabular form using simple English statements. These will be derived from the user stories as we will see in the next chapter. In fact, the functional requirements document is really just a summary of the story cards as they exist at the time. Where it is necessary to break a complex functional requirement down into a set of simpler ones, do so but try to preserve the connection between related requirements by grouping and numbering them together. Looking at the F-net system, it is clear that one actor or user is the patient and they wish to be able register and upload their details. Two basic requirements can be brie y stated as Patients can create an account Patients can edit their details These will be mandatory the system must have them. Each will be described in more detail using a story. Another possible requirement is, Patients can view past appointments. This may be less critical it is an optional requirement. We thus classify each requirement as being Mandatory: it must be present in the nal solution; Desirable: it should be present if at all possible; Optional: only implemented if all others are done and there is still time. Naturally the client will specify these levels, and they may change during the course of the project. An extract from a set of requirements produced for the F-net system is M: required function D: desired function O: optional function
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4.8 Developing the Requirements Documents Patient ID 1 2 3 4 5 6 7 8 Patients can Patients can Patients can Patients can Patients can Patients can Patients can Patients can Description create an account edit their details login to their account book an appointment view their booked appointments view past appointments cancel appointments (restrictions apply) delete their account permanently
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Priority M M M M D O M O
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Clinics ID 9 10 11 12 13 14 15 16 17 Clinic Clinic Clinic Clinic Clinic Clinic Clinic Clinic Clinic staff staff staff staff staff staff staff staff staff can can can can can can can can can Description create an account login to their account edit their details add physiotherapists to the clinic view their physiotherapists appointments add appointments to their physiotherapists diaries remove a physiotherapist from the clinic cancel appointments from their physiotherapists diaries delete their account permanently Priority M M D M D D M D O
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Physiotherapists ID 18 19 20 21 22 23 24 25 26 27 Physiotherapists Physiotherapists Physiotherapists Physiotherapists Physiotherapists Physiotherapists Physiotherapists Physiotherapists Physiotherapists Physiotherapists can can can can can can can can can can Description create an account login to their account edit their details add themselves to a clinic view their appointments for a single clinic view their combined diary for all clinics add appointments to their diaries remove themselves from a clinic cancel appointments from their diaries delete their account permanently Priority M M D M M D M M M O
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If some of the requirements are poorly de ned or subject to change, identify them and put some measure on their risk of change, even if it is just a number 1 . . . 5 (low risk . . . high risk) that you allocate on the basis of your best guess given the knowledge you have available. We will nd this useful later.
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