The opportunity to engage in a behaviour that has a high probability of occuring can be used to reinforce a behaviour that has a lower probability of occuring. This principle was formulated by

A behaviour that is accidently followed by reinforcement may be strenthened. This is called 

Systematic desensitization is developed by

Behaviour modification technique is based on the basic principle of 

............ helps a person to stand for his rights without violating that of others.

Match the following A with B :