The psychotic experience is often seen as qualitatively different from normality. Empirical data show that psychotic symptoms have to be described on a continuum between normality and psychosis. A model of construction of delusional ideas starting from making sense of perceptual aberrations integrating reasoning styles, personal and cultural variables is presented. This model also show how delusional ideas are maintained through bias of selection and behaviors associated with delusional ideas which are naturally reinforced in natural environments. Cognitive-Behavior Therapy (CBT) for psychotic symptoms is a validated psychological set of techniques useful to treat persistent psychotic symptoms. CBT is presented as a five steps intervention including: engagement and assessment, education and normalization of psychotic symptoms, verbal questioning of evidences supporting the beliefs, reality testing and consolidation.