“…More insidiously, techniques that are ostensibly neutral may in fact have an in-built tendency to support particular outcomes: in road transport, for example, growth-oriented policies have historically been underpinned by particular forms of appraisal (Grove-White, 1997;Owens and Cowell, 2002). In this, and other areas, commentators have drawn attention to the normative presuppositions hidden iǹ`t he methodological thicket'' of appraisal (Grove-White, 1997, page 26; see also Dabinett and Richardson, 1999;Hajer, 1995;Owens and Cowell, 2002), exposing an intricate interweaving of facts and values, and showing that the`separation of powers' is an illusion. Some have suggested that governments restrict the kind of analysis performed, to preempt questioning of these implicit assumptions (see, for example, Amy, 1984).…”