EPI Principle
The EPI principle builds on the well known idea that the observation of a "source" phenomenon is never completely accurate. That is, information present in the source is inevitably lost when observing the source. Moreover, the random errors that contaminate the observations are presumed to define the probability distribution function of the source phenomenon. That is, "the physics lies in the fluctuations." The information loss is postulated to be an extreme value. Thus, if the Fisher information in the data is, and the Fisher information in the source is, the EPI principle states that:
The extremum for most situations is a minimum, meaning that there is a comforting tendency for any observation to describe its source faithfully.
Read more about this topic: Extreme Physical Information
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