From practical experience perspective, the key to discover lessons learned is "outliers": look at your data, find outliers, discover how any why it's there, then report good ones as a lesson to replicate, and bad one to be avoided.
If that sound good, let me know I can explain more if needed.
Monir A Wahas
Founder Inspiring Vision for ConsultingVery interesting topic, thank you.
More about this topic still needed.