Lindblom (1959) and Churchman (1967) make it clear that the assumption of synoptic or complete rationality in planning systems is not only inadequate in a methodological sense, but illegitimate in an ethical or professional sense.
Source, in full
J.I. MacLellan (2009). "Brokering the Local Global Dialectic". In: Linking Climate and Impact Models to Decision and Policy Making. Edited by A. Fenech, and J.I. MacLellan. Environment Canada, Toronto. The first reference mentioned here refers to Charles E. Lindblom (1959) "The Science Of 'Muddling Through'." In: Public Administration Review, 19, p. 79–88