Total systems intervention (TSI) is a meta-methodology which interpret
s and brings into action a range of problem solving methodologies, vie
wing problem solving as a process of intervention where practitioners
can learn about and manage complex interacting issues. When first pres
ented, TSI was the framework that evolved from one of many possible op
erationalisations of critical systems thinking. From these beginnings,
TSI (as one practical implementation of the principles of CST) now co
ntinues its development into a methodology for use by problem solvers
in all situations, not just the organisational-enterprise setting. Thi
s paper presents a detailed operationalisation of the critical review
mode, the framework of which may also be of use in the operationalisat
ion of the other modes in TSI.