Our textbook of System Integration course highlighted in Chapter-2: Program & Project Planning that,Project Planning is well defined in the Project planning process area in CMMI for Development (version 1.3). Now, you are required to explore more about CMMI for Development, version 1.3 and answer the following questions:

Q2. What is the difference between CMMI framework and CMMI models?

To answer the above three questions, you can access the following source of information:

Carnegie Mellon, November 2010. CMMI for Development, Version 1.3, Improving Processes for Developing Better Products and Services. Carnegie Mellon, Pittsburgh, PA.

you can search for more resources if you did not find enough information in the main source.