The Strathclyde Inventory: Development of a Brief Instrument for Assessing Outcome in Counseling According to Rogers’ Concept of the Fully Functioning Person

Abstract

The Strathclyde Inventory is a self-report instrument assessing Rogers’ concept of the fully functioning person. Using data collected from a UK-based counseling service, we investigated its validity for use as an outcome measure, and produced a 12-item brief version that maintained fit to the Rasch model and construct representation.

Keywords:

• Fully functioning person
• measure development
• outcome measurement
• Rasch model
• Strathclyde Inventory

Acknowledgments

We wish to acknowledge the contributions of Elizabeth S. Freire, who initiated the development of the Strathclyde Inventory, Brian Rodgers, who co-developed the SI-16, and Chinatsu Tashiro, who carried out an unpublished MSc study based on an early subset of the data used here.

Disclosure Statement

No potential competing interest was reported by the authors.

Additional information

Notes on contributors

Susan Stephen

Susan Stephen, PhD, is a person-centered counselor, supervisor, trainer and researcher based in Glasgow, Scotland. Her research interests include investigating congruent functioning in person-centered therapy, and supporting practitioners to develop an informed approach to measurement in counseling.Robert Elliott, PhD, is Professor of Counselling at the University of Strathclyde, Glasgow, Scotland, and a Fellow in the Divisions of Psychotherapy and Humanistic Psychology of the American Psychological Association. A psychotherapy research methodologist, his research focuses on outcomes and change processes in emotion-focused and other humanistic experiential psychotherapies.