To fully occupy its original place of personalised and safe therapy, Homeopathy must prove its own effectiveness in factual medicine. For this we propose here a method based on a general observational databank which enables the classification of the effects of any prescription according to the level of evidence and puts them according to their purpose into 4 strata: medico-social impact, traceability of the similarity ratio, infinitesimal doses, Materia Medica.