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.
[1] Boundary critique is a general systems thinking principle similar to concepts as multiple perspectives, and interconnectedness.
Boundary critique according to Cabrera (2006) is "in a way identical to distinction making as both processes cause one to demarcate between what is in and what is out of a particular construct.
"[2] Boundary critique is based on Churchman's (1970)[3] argument, "that what is to be included or excluded for any analysis of a situation is a vital consideration".
According to Kagan et al. (2004) he "offered a detailed challenge to the idea that the boundaries of any system are given and linked to "social reality".