This task tries to establish a method of selection of experts in a peculiar field: children sexual abuses declarations and the one of guilty responsability degree of mental sick persons. Usually courts ought to select experts only by nomination and cooptation of professionals simply with a diploma of psychology or psychiatry. We used a combined model. The first selects between experts the best ones with two mains skills discrimination and consistency and the second one explores credibility declarations of children between five and twelve about sexual abuses. Measuring the performance is the task. Then wa have compared these results to those of other groups of general population in a democracy worry. We noticed that professors and other practioners in law or psychology or psychiatry can perform as good as professional experts.
