[politelemon]

Through a double blind method. Open source or publish your calculations so that anyone can derive the same personality/event results for a given set of criteria for a person. That is, without you being the intermediary, the result of the calculation performed by different people should arrive at the same result.

The result will also need to avoid the use of Barnum statements https://en.wikipedia.org/wiki/Barnum_effect as they are subject to interpretation.