The basic requirement for CMM level 5 is casual analysis and continuous improvement which is explained later from a typical software project point of view.
Causal Analysis and continuous improvements
The main steps for proper Causal Analysis and continuous improvements are as follows:
a) The scope of DP
b) The frequency of DP Meetings
c) The procedure to capture minutes and findings of DP
d) The procedure to perform root cause analysis for the defects
e) Take necessary steps based on the analysis