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Confused about certain concepts in DSDM

Ryan McClain
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Referring to DSDM and 'Stage 2: Functional Model Iteration' this article:

To find Stage 2, press the 'page down' key on your keyboard eight times.

What is a 'model'? Is it something tangible? Is it a document, a piece of software?

What do I have to picture in my head if people speak of 'a functional model'?

Why do they talk of prototypes and not actual implemented, concrete and completed subsystems (pieces of software (releases?) that comply to a set of the highest priority requirements)?

What is a 'user'/'end-user'?
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