The Educational Pair Test is a graphic test that has been gaining importance for its diagnostic and prognostic value. However, descriptions of this graphic technique are usually brief. Therefore, this text is intended to be useful as specific knowledge and at the same time complementary to other more extensive texts about the Projective Graphic Tests. Here, the author clearly transmits her vast professional experience and invites us to make an exhaustive and enjoyable journey through the history, theory and practice of the Educational Couple Test. To do so, she establishes three axes: the study of the test itself, the mental and social representations of learning and teaching that can be manifested in it, and the research in which it is involved. In addition, he shows and exemplifies, with various illustrations and cases, the different ways of analyzing the data in its qualitative and quantitative aspects; alluding to its dual purpose both in diagnostic and educational research. Thus, his work is oriented both for students and professionals of Psychology, Psychodiagnosis, Educational Psychology and Psychopedagogy.