Final answer:
The teaching method exemplified by encouraging dance class members for each step is 'shaping', a technique that rewards successive approximations to learn a complex dance routine.
Step-by-step explanation:
Encouraging the members of a dance class when they complete each individual step is an example of the teaching method known as shaping. This method, derived from Skinner's operant conditioning experiments, involves rewarding successive approximations of a target behavior to gradually achieve the desired outcome.
In the context of a dance class, this means the instructor would reward students as they successfully perform each step or movement, effectively breaking down a complex dance routine into manageable components that are easier for students to learn and master.