1) The effect of the reinforcement procedure decreases as the delay between the response and the outcome increases. Reinforcers delayed more than 60 seconds have little or no reinforcing effect.

2) Reinforcement which occurs while the reinforced person is still responding, or at least before he or she has a chance to make another response.

3) Reinforcement of every response. Sometimes called "regular" reinforcement. Nonintermittent reinforcement.