In the context it was written, business logic is the rules that govern how the data items are processed, display logic is how the user sees them.

I see an area of application display that is not covered. What about conditional display? That is not _how_ the user seems them. It is what the user sees and a business rule made the choice.

In the context written, the distinction is made because it separates concerns.

I'm with you, but I would say it clarifies concerns. It makes it clear what sort of business logic is being executed, in this case the business rules guiding display.

I'm asserting that display logic ISA business LOGIC while you seem to be saying that business logic DISPATCHES-TO display logic.

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