A note is text that can accompany nearly any other model component. It may provide detail, background, or rationale. A note is an informative model component.
For example, a note that accompanies the specific practice “Implement selected action proposals developed in causal analysis” in the Causal Analysis and Resolution process area is “Only
changes that prove to be of value should be considered for broad implementation.”
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CMMI-ACQ 1.2
3. 
Notes