Introduction

The Florida Obsessive-Compulsive Inventory (FOCI) is a brief self-report psychometric instrument designed to assess the presence and severity of Obsessive-Compulsive Disorder (OCD) symptoms. The scale was developed as a practical clinical tool to identify obsessive thoughts and compulsive behaviors while also evaluating the level of symptom severity. Due to its brief format and ease of administration, the FOCI is widely used in clinical assessment, psychological research, and treatment monitoring.

Description

The FOCI consists of two main sections:

  • Symptom Checklist: Identifies the presence of common obsessions and compulsions experienced by the individual.
  • Severity Scale: Evaluates the intensity and impact of obsessive-compulsive symptoms.

The first section includes 20 common obsessive and compulsive symptoms, allowing individuals to indicate which symptoms they have experienced. The second section assesses symptom severity and overall clinical impact.

The instrument evaluates important OCD-related domains, including:

  • Intrusive thoughts and obsessions.
  • Repetitive behaviors and compulsions.
  • Symptom intensity.
  • Interference with daily functioning.

Purpose

The FOCI is designed to:

  • Detect obsessive-compulsive symptoms.
  • Identify specific patterns of obsessions and compulsions.
  • Assess OCD symptom severity.
  • Monitor treatment progress.
  • Evaluate outcomes of psychological and pharmacological interventions.

Administration

The questionnaire is self-administered and requires only a short time to complete. It is suitable for adolescents and adults in clinical and research settings. The brief format makes it useful for screening, follow-up assessments, and repeated measurement during treatment.

Scoring

The FOCI scoring system includes two components:

  • A symptom checklist identifying experienced obsessions and compulsions.
  • A severity rating scale evaluating symptom intensity.

Severity items are typically scored from:

0 = Not severe
to
4 = Extremely severe

Total scores provide an overall indicator of OCD symptom severity.

Interpretation

Higher FOCI scores indicate greater severity of obsessive-compulsive symptoms, including increased distress, frequency, interference, and difficulty controlling symptoms.

The instrument provides information about both the type of OCD symptoms present and their overall severity, supporting clinical decision-making and treatment planning.

Statistical Analysis

Psychometric evaluation of the FOCI commonly includes:

  • Descriptive statistics.
  • Internal consistency reliability (Cronbach’s alpha).
  • Test–retest reliability.
  • Exploratory and Confirmatory Factor Analysis (EFA/CFA).
  • Item-total correlations.
  • Convergent and discriminant validity.
  • Correlation and regression analyses.
  • Sensitivity to treatment change.

Research has demonstrated satisfactory reliability and validity, supporting the use of the FOCI as an efficient measure of OCD symptoms.

Applications

The FOCI is widely used in:

  • Clinical psychology.
  • Psychiatry.
  • Anxiety disorder research.
  • OCD screening and assessment.
  • Cognitive Behavioral Therapy (CBT) outcome studies.
  • Treatment monitoring.

Advantages

  • Brief and easy to administer.
  • Assesses both symptom presence and severity.
  • Useful for clinical screening and research.
  • Suitable for repeated assessment over time.
  • Provides a structured profile of OCD symptoms.

Limitations

The FOCI is a self-report measure and may be influenced by insight, recall accuracy, and willingness to disclose symptoms. It should not be used as a standalone diagnostic tool and should be interpreted alongside clinical interviews and comprehensive psychological assessment.

References

Storch, E. A., & Murphy, T. K. (2007). The Florida Obsessive-Compulsive Inventory: Development, Reliability, and Validity. Journal of Clinical Psychology, 63(9), 936–946.

Storch, E. A., & Lewin, A. B. (2010). Assessing Obsessive-Compulsive Disorder in Children and Adults: A Review of the Literature. Journal of Anxiety Disorders, 24(6), 559–566..