This article analyzes the relationship between how rationality is conceived
and hour democracy is practiced in the Bureau of Reclamation, a water deve
lopment agency in the Department of Interior. The efforts of some inside th
e agency to institutionalize rational decision-making models, partly in res
ponse to new environmental law, expanded the number and range of interest g
roups that participated in its decisions by incorporating their preferences
into their models for evaluating plans. But the terms under which people c
ould express their values and interests were strictly controlled in ways th
at some felt misrepresented their concerns. How we conceive of rationality
has important implications for how and which people are included in bureauc
ratic decision making.