Deciding how to intervene depends on constant adjustments based on certain theories, principles and methods. Learning requires a specific type of practice called "deliberate practice."
Based on research, some of the key elements of such practice include: goal setting; trial and error; focusing on a few specific "chunks" of techniques at a time; and “communities” (e.g. groups or teams) that provide reinforcement and high quality feedback. To find out more see the reference list on Deliberate Practice.