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Definition: a Current Reality Tree is a visual root cause analysis approach in the form of a graphical statement used within the Theory of Constraints, identifying root causes that are common to some or most problems under study.
A CRT maps out a sequence of cause and effect from the core problem to the symptoms.
A CRT is built by first describing undesirable effects (UDEs). From here, in a step by step process the intermediate causes and effects and preconditions for these UDEs are established. This process is repeated until only one precondition remains: the root cause.
Similar to Ishikawa Diagram, 5 Whys.