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    Requirements Testing


    A D V E R T I S E M E N T



    Home » Requirements Testing » Order In A Disorderly World

    Order In A Disorderly World


    We have considered each requirement as a separately identifiable, measurable entity. Now we need to consider the connections between requirements and to understand the effect of one requirement on others. This means we need a way of dealing with a large number of requirements and the complex connections between them. Rather than trying to tackle everything simultaneously, we need a way of dividing the requirements into manageable groups. Once that is done we can consider the connections in two phases: the internal connections between the requirements in each group; and then the connections between the groups. It reduces the complexity of the task if our grouping of requirements is done in a way that minimises the connections between the groups.

    Events or use cases provide us with a convenient way of grouping the requirements [8, 4, 11,]. The event/use case is a happening that causes the system to respond. The system's response is to satisfy all of the requirements that are connected to that event/use case. In other words, if we could string together all the requirements that respond to one event/use case, we would have a mini-system responding to that event. By grouping the requirements that respond to an event/use case, we arrive at groups with strong internal connections. Moreover, the events/use cases within our context provide us with a very natural way of collecting our requirements.

    The event/use case is a collection of all the requirements that respond to the same happening. The n-to-n relationship between Event/Use Case and Requirement indicates that while there are a number of Requirement to fulfil one Event/Use Case, any Requirement could also contribute to other Events/Use Cases. The model also shows us that one Requirement might have more than one Potential Solution but it will only have one Chosen Solution.

    The event/use case provides us with a number of small, minimally-connected systems. We can use the event/use case partitioning throughout the development of the system. We can analyse the requirements for one event/use case, design the solution for the event/use case and implement the solution. Each requirement has a unique identifier. Each event/use case has a name and number. We keep track of which requirements are connected to which events/use cases using a requirements tool or spreadsheet. If there is a change to a requirement we can identify all the parts of the system that are affected.

    Requirements Test 10

    Is each requirement tagged to all parts of the system where it is used? For any change to requirements, can you identify all parts of the system where this change has an effect?


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