Certain fundamental concepts and technical aims must first be clarified before the problems in current psychiatric nosology can be solved. Szasz suggests an operational mode of approach, with limited, socially and methodologically well-defined plans of attack on a specific problem. A nosological system worked out and suited to one type of psychiatric situation cannot validly be applied to another, very different psychiatric situation. For example, insights gained from the psychoanalytic situation cannot be directly applied to those like child rearing or the disposition of criminals in courts of law. A related consideration is that of terms that function as panchrestons—words that 'explain everything', e.g., the diagnostic term, schizophrenia. Such a category cannot be readily verified for classification, and it gives the impression of a more or less homogeneous group of mental