- The requirements analysis "film": http://silvaonsoftware.blogspot.pt/2016/05/process-software-requirements-team.html
- To learn some specifics: See your QMS "requirements standard" (INTERNAL; includes best practices and conventions).
- Writing good requirements paper here (PDF)
- Requirement types: http://silvaonsoftware.blogspot.pt/2016/11/requirements-requirements-types.html
- For even further info: Read books on the subject and related subjects: Requirements analysis, requirements engineering, business process analysis (a broader topic), writing good requirements. "Google" and/or "Amazon" them.
(@2016-11-23: Fixed link of Req. Std.; 2017-06-08: fixed link)