[The meaning of specialist and adequate documentation for retrospective analysis of sicknesses (author's transl)].

The example of a historic comparative study on the value of the application of inhibitions on thrombocyte aggregation (inhibition of thrombocyte function) was used to prove how important such data can be. Mistakes can also be discovered. Clinical comparisons can only be made when investigations have been made using a planned form to note anamnesis and other data. Special pre-illness history, the findings and course of the illness are not noted on a planned form. These conditions also allow an opinion to be formed from retrospective study of a case. The results help to build a prospective and randomized work.