PSYCHODIAGNOSTICS A DIAGNOSTIC TEST BASED ON PERCEPTION by HERMANN RORSCHACH. INCLUDES RORSCHACTS PAPER- THE APPLICATION OF THE FORM INTERPRETATION TEST . PREFACE TO THE ENGLISH TRANSLATION: The widespread and growing interest in the Rorsehach test among English speaking workers has made apparent the need for a more easily available source of information concerning Rorschachs original and basic work than the German Editions supply. This English Translation is presented in the hope of filling that need. We are aware that this need has been met sporad ically by various unauthorized translations, but these have been available to bet few of those interested in the test. None of these translations was at hand during the preparation of the translation presented here. The task of translating Rorschachs German is doubly difficult. One wishes to present his ideas adequately and at the same time preserve as much as possible of the personality of Rorschach as it is revealed in his choice of words