Dillion’s Model of Sexual Identity Development

Brief Overview

Dillon et al’s synthesis model is based on Fassinger’s parallel model & Macia’s ego identity model and describes determinations and status of sexual identity development.

About the Author

Dr. Frank Dillon is a graduate of the University of Missouri – Columbia and is currently an associate professor on the counseling psychology faculty at the University of Albany.

For more information on Dr. Dillon, please visit the link below:


Printable Summary (PDF)

Previous cohorts of FSU students have developed these printable summaries and used them to prepare for test and papers.  We hope they’ll be of help to you too.

Stages, Levels, Phases, and Components of the Theory

Stages, Levels, Phases, and Components of the Theory:  

  • Three determinations of sexual identity development:
    • Biopsychosocial process
    • Individual identity
    • Social identity
  • Five stages identity development status:
    • Compulsory Heterosexuality
    • Active Exploration
    • Diffusion
    • Deepening and Commitment
    • Synthesis
Application of Theory to Practice

This section is designed to provide student affairs professionals, staff, and faculty members with tips and tools to apply theory to practice.

Annotations of Associated Literature
Original Citation
Additional Resources

This page was written and created by Ashlie Baty. The webpage is maintained by Amanda Peerce and Jesse Ford.  For information on the page, please contact Amanda Peerce at apeerce@fsu.edu or Jesse Ford at jford3@fsu.edu.