The Current Reality Tree (CRT) is the first tool in eliyahu-goldratt's thinking-processes toolkit, used to diagnose the current situation in a system by mapping cause-and-effect relationships from observed symptoms to their underlying root causes.
The construction process begins by listing Undesirable Effects (UDEs) — concrete, observable problems that practitioners can agree are real and unwanted. Using "if-then" causality statements, practitioners connect these UDEs into a tree structure, tracing effects back to causes until they converge on one or a small number of root causes. The logic of inherent-simplicity predicts that many UDEs will share a common root — and the CRT's power is in making that convergence visible and defensible.
The CRT does not rely on intuition or brainstorming. It requires that each causal arrow be justified by a stated logical connection, and practitioners use validity checks (called Categories of Legitimate Reservation) to challenge faulty causal claims. This rigor distinguishes the CRT from looser root-cause tools like fishbone diagrams.
A well-constructed CRT typically reveals that an organization's most intractable problems stem from a core conflict — a contradiction between two necessary conditions for achieving a goal. This conflict is then taken into the evaporating-cloud for resolution. The CRT thus serves as a diagnostic gateway to the broader TP suite: it defines what needs to change, while the evaporating-cloud identifies what assumption to challenge, and the future-reality-tree tests whether the proposed change will deliver the desired effects.
h-william-dettmer's technical writings and lisa-scheinkopf's work in the tocico community formalized CRT construction rules for practitioners without direct access to Goldratt.