Definitions for CMMI Requirement Types in TFS2010

Question

I've recently been informed that I need to define the requirements for the project I'm working on using TFS and CMMI. Upon writing a new requirement, you must supply a "Requirement Type". My question is, where can I find actual definitions of the different requirement types? Yes, of course I have googled this already and have found some glossaries that are closely aligned, but not perfect.

If any of you out there have experience with CMMI, and can define these types or point to a better source of information, I would be greatly thankful.

To make this easier, the CMMI requirement types are listed (in TFS) as:

• Business Objective
• Feature
• Functional
• Interface
• Operational
• Quality of Service
• Safety
• Scenario
• Security