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The internal measurement is one of the measurement theories. From, we introduce the definition of the internal measurement. The experience consists of "unremitting measurements". These "unremitting measurements" appear only in the experience. In the experience, if any individual has a relation to another individual then this is a "measurement which identifies another individual", where this measurement enable if the individual can specify the effects from another individual. Moreover, a "measurement which identifies another individual" is unremitting in the experience. As above a measurement such that if any individual measure another individual then this measurement inherent in "unremitting measurements" is called the internal measurement. This theory is found by Kouichirou Matsuno and is developed by Yukio-Pegio Gunji.
There is a likeness between internal measurement and endophysics. However, they have slight difference, that is, internal measurement have before-after logical asymmetry.