Above all, it is necessary to analytically analyse all the tests performed and the therapies undertaken. Very important indications, positive or negative, can be found in the documents that the couple has in their possession from previous centres. When necessary some tests have to be repeated, and the validity of many analyses has to be verified; some, in fact, are performed only once in a lifetime and others are valid for a very long time. It is often useless to add to the stress levels and costs of those who have already followed this difficult path for a long time. Stimulations performed, in particular, give a more precise idea of the hormonal analyses already performed, which are useful. On the basis of all these elements put together, a real strategy is put in place for a path that will lead to success.