The following clinical assessment measures are useful for assessing the preoccupation, pervasiveness, intensity, inflexibility, significance, conviction, frequency and/or content dimensions of psychosis:

Symptomatology

• Brief Psychiatric Rating Scale (Overall & Gorham, 1962)
• Positive and Negative Syndrome Scale (Kay et al., 1989)
• Scale for the Assessment of Positive Symptoms (Andreason, 1984)
• Scale for the Assessment of Negative Symptoms (Andreason, 1989)
• Comprehensive Psychopathological Rating Scale (Asberg et al., 1978)

To Quantify the Dimensions of Psychotic Symptoms

• Psychotic Symptom Rating Scales (Haddock et al.,1999)
• Topography of Voices Rating Scale (Hustig & Hafner, 1990)
• Schedule of Assessment of Insight (David, 1990)
• Voice Power Differential Scale

To Conduct a Cognitive Behavioural Assessment

• Antecedent and Coping Interview (Tarrier, 1992)
• Maudsley Assessment of Delusions Scale (Wessely et al., 1993)
• Cognitive Assessment of Voices: Interview Scale (Chadwick et al., 1996)

To Assess Beliefs & Schemas

• Evaluative Beliefs Scale (Chadwick et al., 1996)
• Dysfunctional Working Models Scale (Perris et al.,1998)
• Beliefs About Voices Questionnaire – R (Chadwick & Birchwood, 1995; 2006)
• Voices Acceptance & Action Scale (Shawyer et al., 2007)

To Assess Adherence in Conducting CBT

• Cognitive Therapy Scale for Psychosis (Haddock et al., 2001)
• Cognitive Therapy for Psychosis Adherence Scale (Startup et al.,
  2002)