A long time ago, ppl figured out that no one process was right for every organization, project, technology, etc. They created process frameworks (things used to create a process) and they saw that they were good.
Then ppl came along and said that they were "too complicated" we need something Agile! In actual fact, those ppl didn't understand the process frameworks and just created a specific instance of one and they wondered why it didn't work for all projects, organizations, technologies, etc. And then they said those processes are "too simple" - what can we do? "Maybe we should create a way of generating a process?", they then said. And so it went...
Then ppl came along and said that they were "too complicated" we need something Agile! In actual fact, those ppl didn't understand the process frameworks and just created a specific instance of one and they wondered why it didn't work for all projects, organizations, technologies, etc. And then they said those processes are "too simple" - what can we do? "Maybe we should create a way of generating a process?", they then said. And so it went...
https://en.wikipedia.org/wiki/Rational_Unified_Process
https://en.wikipedia.org/wiki/Microsoft_Solutions_Framework