Abstract: Regulation is the abstract concept when a state regulates her subjects with the legal imperatives then it shapes a material body. It is may prescribe conduct, calibrate incentives, or change preferences through which an institution can control her subjects in a formal manner and a state runs through the same practice. The instrument of regulation include controls on market entries, prices, wages, development approvals, pollution effects, employment for certain people in certain industries, standards of production for certain goods, the military forces and services.it has two standard theories namely: the public interest theory and capture theory but the theories consider as the normative in character. Here we suggest another type of theory of the regulation of the state systems namely theory of regulation for legitimacy, which is primarily calculated as the realist theory in nature because the state fills she is the just another institution of the great society in terms of regulation and we incorporates three types of models of regulation of the state systems. The research article has been addressed with the qualitative and quantitative methodologies. Key words: Regulation, Public Interest Theory, Capture Theory, Theory of Regulation for Legitimacy.
Keywords: Regulation, Public Interest Theory, Capture Theory, Theory of Regulation for Legitimacy