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These are some common standards, processes, and methodologies in the IT industry.
Software Development Process Improvement (link) describes where and how ITIL, CMMI, and other standards fit in.


The Information Technology Infrastructure Library (ITIL) is a set of concepts and practices for managing Information Technology (IT) services (ITSM), IT development and IT operations.
Wikipedia page (link).
IT Process Maps ITIL wiki (link).


Capability Maturity Model Integration (CMMI) is a process improvement approach that helps organizations improve their performance. CMMI can be used to guide process improvement across a project, a division, or an entire organization.
Wikipedia page (link).
Software Engineering Institute of Carnegie Melon University (link).

CMMI for Development

Download page (link).