Process routes

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There are multiple routes that could populate the same essential package structure. For example, if you have a rich collection of reusable components, a very short delivery schedule, and flexibility in requirements, you might follow an "assemble" route in which:

You model the essential problem domain or business to clarify terminology
You do a very "light" system specification; feasibility based on existing components will help define what you can actually deliver
You then work with your component assets and figure out a mapping to the essential domain model
Use this to estimate the work to be done, and "reverse engineer" the more detailed requirements you intend implement so the client agrees.
Build the system.

This "route" would be quite different from one in which you will build from scratch, or subcontract to multiple vendors who must integrate later; and your requirements have much less flexibility.

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