Blog 23. Refine requirements for the electronic expansion |
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In the last Caravan blog 6, Architecture Physical View, I presented the architectural drawings and pictures of the “electronic expansion” in such a way that the Electronic expansion still was a black box with invisible content, surrounded by the Caravan interior furnishing, the Caravan shelf, and the environment to the caravan. I will still not open the “electronic expansion” black box, but from now on, and in the following half dozen schedules, I will consider the black box to be the target for the development actions according to Cpdm. Now, the trick is to take this black box as the starting point when considering and capturing requirements on functions and content of it. In Cpdm, this is made in two steps; |
The first is to recall the environmental restrictions shown in the Caravan blog 4, "Capturing the restrictions of the caravan electronic expansion" and decompose them into refined requirements that will only target the electronic expansion. Consider each environmental restriction, shown again with green text below, and imagine their consequences on the electronic expansion black box, illustrated with bulleted black text below. This procedure is called to refine requirements, and ensures that no inner conditions that emerge from outer restrictions are forgotten. The next blog will show how to continue with the second step, to add new requirements to the electronic expansion black box. |
