The metaphor of the “black box” is very common in programming. It is so general that it’s nearly meaningless; but it summarizes a lot of specialized principles nicely and shows a unifying principle. A black box is characterized by: It can be applied to “modules” on all levels of abstraction.

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Recently, I was discussing adding a feature to an application which is about event creation and booking. The project manager has a strong database background and works on the schema himself. The schema is also his go-to tool to express changes in the features. But thinking about the real Domain in terms of objects revealed much, much more.

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