This chapter discusses primary prevention aimed at lowering the incidence (or making less probable the onset) of psychiatric disorders.

1. Basic prevention, which aims at the elimination of those items that increase potentiality or increase the vulnerability for the disorder.

2. Longitudinal prevention, which aims at assisting the individual throughout his life to avoid those developments that will enhance actualization of schizophrenia.

3. Critical prevention, which aims at avoiding those factors or specific events that will precipitate an attack or onset of schizophrenia.