Institutional Analysis and Development Framework

An action situation, or action arena, is the structured social space in which participants with particular roles, information and choices interact to produce outcomes — for example, irrigators deciding water withdrawals, or villagers enforcing forest-use limits. It is the analytical heart of the framework: biophysical conditions, community attributes and rules-in-use all feed into it, and the interactions and outcomes flow out of it. Almost any governance question can be framed by identifying the relevant action situation and the factors that structure it.

Rules-on-paper are the formal, written laws and regulations; rules-in-use are the actual working rules that participants know, follow and enforce in practice. Ostrom emphasised that these often diverge sharply — formal rules may be ignored, while unwritten norms and shared strategies genuinely govern behaviour. The IAD framework directs analysts to study the rules-in-use, because it is these, not the statutes, that shape incentives and explain why governance arrangements produce the outcomes they do.

No. It is most famous for Ostrom's commons research, but it is a general framework for analysing institutions in any setting involving rules and collective action — public-good provision, bureaucracies, markets, urban governance and more. The commons work demonstrated its power, and it generated specific design principles for sustainable common-pool-resource governance, but the framework itself is a broad analytic scaffolding for understanding institutional diversity wherever rules structure human interaction.