There is no process model that is valid for all processes. All processes are based on the Metamodel but need to be tailored to fit certain requirements.
Ex. The metamodel for a car stays the same but there can be multiple tailored processes. The tailored processes for a gas, electric, and diesel car will be different. Rather than including all of the different safety processes for each and having to pick and choose which ones need to be completed, a tailored process will only give what is relevant to a specific process.
TBD