Mandelbug (from Fractal innovator Mandelbrot) is a computer bug that has causes that are so complex that its behavior appears chaos theory. This word also implies that the speaker thinks it is a Bohr bug rather than a Heisenbug.

It can be argued, according to same principle as the Turing test, that if there is no way for a judge to differentiate between a bug whose behavior appears chaotic and a bug whose behavior actually is chaotic, then there is no relevance in the distinction between mandelbug and heisenbug, since there is no way to tell them apart.

Some use mandelbug to describe a bug whose behavior does not appear chaotic, but whose causes are so complex that there is no practical solution. An example of this is a bug caused by a flaw in the fundamental design of the entire system.

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