What are the useful techniques in program design?

A broad question, with many answers.

When designing a program you can use:

Setting up requirements, possibly in a use-case form ("as a ... I want to ... so that ...")Mapping the verbs and nouns in your requirements to classes and operations Drawing UML diagrams of the subject matterCreating flow charts and sequence diagrams Identify component boundaries with thin interfaces to keep complexity organized and local

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