Drdeenz_ The Psychometric Tool

Delusion Test – Deenz Delusional Beliefs Scale (DDBS)

This self-assessment is based on Deenz Delusional Beliefs Scale (DDBS), a 48-item self-assessment originally developed by DM Dar. Drdeenz provides an interactive digital version for educational, informational, and self-exploration purposes only. Read More

Deenz Delusional Beliefs Scale (DDBS)

Background

Delusional beliefs are strongly held beliefs that differ from commonly accepted reality and may persist even when conflicting evidence is available. While unusual beliefs and interpretations can occasionally occur in the general population, persistent or strongly held beliefs may influence how individuals perceive themselves, other people, and the world around them.

The Deenz Delusional Beliefs Scale (DDBS) was developed to measure a broad range of delusion-like beliefs and cognitive experiences. The assessment evaluates suspicious thinking, unusual interpretations of events, beliefs about personal significance, exaggerated self-importance, conviction in one's beliefs, reality testing, and the impact of these beliefs on everyday functioning. Higher scores indicate a greater tendency toward delusion-like beliefs and unusual interpretations of reality. This assessment is intended for educational and research purposes and should not be considered a clinical diagnosis.

Procedure

Read each statement carefully and answer honestly based on your typical thoughts, beliefs, and experiences. There are no right or wrong answers. Select the response that best represents your usual experience rather than isolated events.

Participation

In third part you may skip any question or stop the assessment at any time. For the most accurate results, answer each statement honestly based on your usual experiences over the past several months.

Scoring & Interpretation

The Deenz Delusional Beliefs Scale (DDBS) consists of three assessment parts.

Part 1: Feelings

Dimensions: Suspicion (4 items), Uncertainty (4 items), Anxiety (4 items), Isolation (4 items)

Total Items: 16

Part 2: Thoughts

Dimensions: Reference (4 items), Grandiosity (4 items), Control (4 items), Conviction (4 items)

Total Items: 16

Part 3: Experiences

Dimensions: Perception (4 items), Certainty (4 items), Reality (4 items), Impact (4 items)

Total Items: 16

Each dimension contains one reverse-scored item.

Raw Score Range: 0–192

Percentage Score:
(Raw Score ÷ 192) × 100

Deenz Delusional Beliefs Scale (DDBS) Questionnaire

Instructions & Terms

Below is the Deenz Delusional Beliefs Scale (DDBS), a digitally adapted 48- items self-assessment questionnaire.



Sources
  • Dar, D. M. Deenz Delusional Beliefs Scale (DDBS). Drdeenz Research Project.
  • Peters, E., Joseph, S., Day, S., & Garety, P. A. (2004). Measuring delusional ideation: The Peters et al. Delusions Inventory (PDI). Schizophrenia Bulletin, 30(4), 1005–1022.
  • Freeman, D. (2007). Suspicious minds: The psychology of persecutory delusions. Clinical Psychology Review, 27(4), 425–457.
  • American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (5th ed., text rev.). American Psychiatric Association.

    • Version History

    Version 1.0 – 06/29/2026 | Initial release.