You can describe functional requiremens as “exemplary business process model”. They describe processes from the viewpoint of stakeholder and the tools and materials used.
Please consider the following example:
Member of the 42 family
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req42
req42.de
The practical framework for requirements engineering.
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arc42
arc42.org
You are here
The proven template for documenting software architecture. You are on docs.arc42.org, its documentation.
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systems42
systems42.org
Agentic engineering based on req42 and arc42.