All teachers and educators working with children suffering from mental disorders and functional disorders that are found sooner or later have to read a diagnostic, which is usually provided by a psychiatrist or psychologist neuropsychiatrist. Diagnosis is a complex process of knowledge, by using observations, interviews and tests, defined diagnostic tools; we can examine various aspects of the functioning of the personality of a subject. (Venuti, 2001) Observation is a fundamental tool in the diagnostic process and is used to formulate and to describe the diagnosis and to compile a profile of functional diagnostics. Firstly – the doctor uses observation to capture the subject's behavioral characteristics that identify and describe the symptoms and therefore proceed to a diagnostic classification. Nonverbal factors play a fundamental role in this context.