In BSA WoodBadge Training they taught us to teach the youth leaders how to teach using the "EDGE Training" techniques.

This is a simple four-step process used for teaching any skill.

• Explain—The trainer explains how something is done.
• Demonstrate—The trainer demonstrates while explaining again.
• Guide—The learner tries the skill while the trainer guides him through it.
• Enable—The learner works on his own under the eye of the trainer.

From The Youth Leadership Training Continuum

A more detailed explanation at the October 5 Scoutmaster Blog

This applies to teaching adults as well as youth.