by c. eguillon module 9 of discipline and ideas in social sciences of senior high grade 11 Institutions provide social legitimacy and survival through Isomorphism. Isomorphism refers to the similarity in form, shape or structure. Institutions arise, change, and persist due to their regulative, normative and cognitive functions. These functions are isomorphic in nature as they adopt in form, shape or structure to provide social legitimacy, survival or both. Formal institutions are codified rules, policies and norms that are considered official, originating from state laws, government or organizations. Examples: constitution, official law, regulation, standards enforced by the state. Formal institutions are codified rules, policies and norms that are considered official, originating from state laws, government or organizations. Examples: constitution, official law, regulation, standards enforced by the state.