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<ref name="Scheinkopf">Scheinkopf, L., (1999) Thinking for a change: putting the TOC thinking processes to use. St Lucie Press/APICS series on constraint management, pp 143-169.</ref>
[[Image:CurrentRealityTree Example.png|thumb|right|Current Reality Tree example]]
A CRT begins with a list of problems, known as undesirable effects (UDEs.) These are assumed to be symptoms of a deeper common cause. To take a somewhat frivolous example, a car owner may have the following UDEs:
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