Schedules of Reinforcement
The rules detailing how and when a behaviour will be reinforced.
A schedule of reinforcement dictates exactly which occurrences of a specific behaviour result in a reinforcer. Continuous reinforcement provides a consequence every single time the behaviour occurs. You use this to teach new skills.
Intermittent schedules only reinforce some responses. This mimics the real world and builds behavioural persistence, making the behaviour resistant to extinction. Examples include Fixed Ratio (reinforcing every fifth response) or Variable Interval (reinforcing the first response after an average of five minutes).