Representation of the world, a way of seeing things, a model, a rule or a habit which influences our way of interpreting a situation or information.
When we react to an event in a manner which is habitual, and even stereotypical, this is called paradigm.
Paradigms influence behavior. In certain cases, this influence is beneficial. But it is even at times harmful.
Each person acts or reacts following the paradigms which he has adopted: this is the main cause of resistance to change.