We’ve changed our name! Effective January 1, Developmental Life Design is now STAGES International. Find out more in this blog post.

What is the STAGES Model?

What is STAGES?

STAGES is an integrally based development model that charts human development, from the first person perspective encountered in infancy, to the latest researched levels of development— the late sixth-person perspective. The model was created by Terri O’Fallon and is based on decades of educational experience and over seven years of research. Its scoring system is derived from an integral developmental model, that includes quadrants and levels, and addresses lines, states, and reflects on masculine and feminine types. This scoring system has been statistically grounded to match one-to-one, the stages of the widely used and researched model of adult human development, the Loevinger-Cook Greuter lineage.


One of the strengths of the STAGES model is that it has broad application in many dimensions of life and in a variety of fields, both personal and professional. This includes:

  • Psychotherapy, including locating the developmental level of ones shadow material
  • Coaching, which includes approaches to seeing what developmental level is presenting in the moment
  • Parenting, including the interface between the parents’ developmental level and the level of the child


Comprehensive: Includes many dimensions of human experience

Predictive: The precision of the model allows clarity in navigating life stage transitions

Dynamic: Recognizes the fluid nature of human development; it is not a rigid model

Simple “3 Questions” method: For identifying current state/stage in self and others

Developmental “rights”: Every individual has the right to be at whatever level they are at; higher levels aren’t preferenced or considered “better”

Praise for the STAGES Model

“Terri O’Fallon is one of the very most important integrally informed researchers now working. I highly recommend checking her out at your earliest opportunity!”

Ken Wilber

The Integral Vision

“Post-conventional developmental stages are one of the most important yet under researched areas of Integral studies, and we can all be grateful to Terri O’Fallon, who is one of the very few researchers exploring this crucial topic.”

Roger Walsh

University of California Irvine Medical School


Stay Informed


We created STAGES International to offer trainings, workshops and consulting informed by the STAGES model of human development. The tremendous response to our STAGES workshops over the last few years convinced us that we needed to bring this work to a larger audience, and our new website is part of that.

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