Where systems thinking approachesare often different and sometimes irreconcilable because they are based on the reasoning of one individual or another, Human-Centric Functional Modeling aims to become universal through looking inwards to the way all human beings perceive. HCFM provide a methodology that enables first person observations within each of the senses of the body or within the emotions, mind, or consciousness as functional systems to be represented as forming mathematical spaces that in turn enable all possible systems thinking approaches to be represented.This creates the possibility of comparing all systems thinking approaches to determine which is most “fit” in each context in which it is used, and it radically reduces the barriers to reusing the best components of each approach.