When sources have clearly distinct reliabilities, fusion by priority favours the most reliable sources in order to take account of the best quality of information provided.

Let us notice that the operator is not associative. On the other hand, this operator is not unstable when one passes from a state without intersection of possibility distributions to a state with a weak intersection, because no renormalization is performed. It is a positive point compared to adaptive fusions, but which presents the defect to provide not standardized distributions each time .