Boundary critique
Boundary critique (BC) is the concept in critical systems thinking that, according to Ulrich (2002), states that "both the meaning and the validity of professional propositions always depend on boundary judgments as to what 'facts' (observation) and 'norms' (valuation standards) are to be considered relevant" or not. Boundary critique is based on Churchman's (1970) argument, "that what is to be included or excluded for any analysis of a situation is a vital consideration".