 Alibert believed that when diagnosing skin disorders several criteria needed to be used, and attempted to introduce a classification system for diseases that was similar to the method Bernard and Antoine Laurent de Jussieu used in botany.Alibert first classified dermatological disorders according to outer appearance, then he divided them into what he called families, genera and species.This system of classification was represented pictorially by Alibert as the "Tree of Dermatoses".