STAGES is a relatively new developmental model created by Terri O’Fallon, which extends Loevinger’s ego development model and assessment framework. It adds additional stage levels and includes theory of four foundational parameters underpinning all stage transitions, which was inspired by Wilber’s quadrant model. In this presentation we will summarize a number of research studies of, and based upon, on the STAGES model that illustrate the models validity and usefulness. These studies include: a validation study showing that STAGES replicates Cook-Greuter’s model in the Subtle Tier; a Rasch analysis and longitudinal analysis showing the psychometric strength of the assessment; a validation study showing inter-rater consistency over the entire range of levels; studies indicating the validity of using alternative sentence stems; and an analysis and critique of the Ogive cutoff model used in most sentence completions tests.
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