Figure 3-11 An enterprise context diagram showing actors, I/O entities, and enterprise operations

Summary

We have spent this chapter looking at a black-box point of view. We have considered the system, enterprise, or entity as a black box and explored its context so that we can understand what is expected of it, and what collaborations it participates in within that context.

Having gained this explicit understanding, we proceed to the next larger step in MDSD’s transformations, that of examining the entity as a white box, exposing the internal elements, collaborations, and distribution of responsibilities within it. As noted previously, we also will be transitioning from specification to realization; in looking at the black box, we discover what is required of the entity. In looking at the white box, we begin to design how the entity will realize what is required of it.

Chapter 3. Black-box thinking: Defining the system context

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IBM SG24-7368-00 manual Summary