In Advocacy Coalition Framework, with a policy subsystem, policy beliefs are one of the two things (resources is the other) that can help map the outlines of an advocacy coalition.
There is a beautiful table in a good paper-
Hirschi, C. and Widmer, T. 2010. Policy Change and Policy Stasis: Comparing Swiss Foreign Policy toward South Africa (1968-94) and Iraq (1990-91). Policy Studies Journal, Vol. 38 (3), pp.537-563.