. The author conceives rules as action‐determining ideas. They are general and of hypothetical form, and they are of three semantic types: descriptive, technological, and normative rules. The most important categorisation of normative rules is the distinction between rules of behaviour and power‐conferring rules. Both kinds of rules are necessary to establish institutions. Principles are a special kind of normative rules. The social existence of normative rules is connected with their institutionalisation as frames for action. The dynamics of rules is (...) in principle based on two elements: on socially approved habit, and/or on authorised norm creation. (shrink)