Neither rational choice theory, with its emphasis on interest calculation, nor sociological institutionalist theory, with its emphasis on identity-defined rule following, indicates how governments determine which of their multiple interests or identities are at stake in a particular situation or how they develop mutual comprehension of each other's goals. International Regimes for the Final Frontier addresses these gaps by tracing how governments approach an unfamiliar issue—in this case, international agreements regulating human activity in outer space between 1958 and 1988—and examines three ways situation definitions channel governments' approaches to issues or problems.