Focused on stimulus-response association - start to radical behaviorism. Skinner was only focused on the effect of the environment on behavior. Operant theory, radical behaviorism is hard to disprove. If you have a behavior that appears to be uncontrolled, no reinforcement or punishment contingencies acting on it then it can always be argued in operant theory that one hasn't done a good enough job to discover what controls the behavior
No inner mediators - inner determinants do not exist. Skinner took no interest in thought, feelings, personality, etc.
Ideas about what causes behavior - these inner mediators are fictitious. Ideas themselves are behaviors, they are covert behaviors, that we cannot directly observe in others. Ideas are just as environmentally controlled as our overt behaviors
The power of the environment to control behavior - skinner argued that reinforced behaviors are more likely to occur under similar stimulus conditions. When you take a behavior and reinforce it that behavior is more likely to recur to the extent that the organism finds itself in similar environmental situations.
Non-reinforced behaviors are less likely to recur given similar stimulus conditions
Efficient causality - Skinner argued that the antecedent chain of events is solely responsible for behavior.
Functional analysis - the main technique to understand the effect of the environment on behavior. We systematically apply and withdraw contingencies of reinforcement and we study the effect of those contingencies on behavior. We can identify the cause of ones behavior