In case you haven’t come across this or have never really understood it, the theory says managers and leaders become successful and effective roughly based on this mix of experience:
70% from tough jobs
20% from people (mostly the boss)
10% from courses and reading
The original idea was about how high-performing managers learned their stuff.
That study, first identified in research by McCall, Lombardo and Eichinger, has since been verified by other studies. The trio published their research in 1996.
Sourced through Scoop.it from: www.trainingzone.co.uk