Known or Suggested Elements

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      This section should describe any rigid or known pieces of the system. Examples are:

• Required/Suggested processes & related Data Flow diagrams
• Known/Rigid behaviors & corresponding State Transition diagrams
• Required Interface elements (may be more relevant to 'constraints')
• Etc.
• Illustrate as possible
• May be useful to assign reference numbers if these features will be expressed/implemented/modeled in the Requirements Specification below

Reference(s): Braude: pp.148-151 Ch. 3.3 - 3.5