Using the Person of the Therapist to Understand the Isomorphic Process
One of the most challenging and rewarding aspects of becoming a systemic family therapist is learning that the work is not just about understanding families—it is also about understanding ourselves.
In Ecosystemic Structural Family Therapy (ESFT), therapists are trained to observe patterns, identify interactional processes, and make meaning of symptoms within the broader social ecology. Yet one of the most important members of systems in the room is often overlooked: the therapist.
As clinicians work toward competence they inevitably encounter their zone of proximal development, or what many ESFT trainers refer to as a “growth edge.” A growth edge represents the space between what a therapist can comfortably do and what they are still learning to do. It is often where discomfort, uncertainty, and self-doubt emerge. Importantly, it is also where meaningful professional development occurs.
The challenge is that growth edges frequently activate what ESFT would describe as fast thinking. Faced with uncertainty, therapists may become more focused on reducing their own anxiety than on remaining curious about the family’s experience. Rather than following the model, they may move toward self-soothing behaviors such as over-advising, over-teaching, rescuing, withdrawing, becoming overly rigid, seeking compliance, or avoiding difficult conversations altogether.
From an ESFT perspective, these moments are not failures. They are data.
This is where Harry Aponte’s Person of the Therapist (POTT) model offers an invaluable framework. Aponte proposed that therapists must continually examine how their own life experiences, vulnerabilities, strengths, and unfinished emotional business enter the therapeutic relationship. Rather than attempting to eliminate these influences, therapists learn to understand and use them intentionally in service of the family.
Aponte identified six recurring themes that often emerge in the lives of therapists and the families they serve:
- Fear of Rejection / Abandonment: “I will not be accepted”
- Feelings of Inadequacy / Low Self-Esteem: “I am not enough”
- Need for Control: “I must keep control or else”
- Fear of Vulnerability: “don’t show emotions”
- Codependency / People-Pleasing: “meet others’ needs at the expense of my own”
- Trust Issues: “hold the reigns tight so you don’t get hurt”
While different authors and trainers may organize these themes somewhat differently, the central principle remains the same: therapists are often affected by the very struggles they encounter in the families they serve.
When viewed through an ESFT lens, these themes frequently reveal themselves through the isomorphic process.
The isomorphic process occurs when interactional patterns present in the family begin to appear elsewhere in the system—including supervision, teams, organizations, and even within the therapist. A therapist working with a family struggling with criticism may notice becoming self-critical. A therapist working with an avoidant caregiver may find themselves avoiding difficult conversations. A therapist working with a family organized around rescuing may suddenly feel compelled to rescue the identified client.
The therapist’s activation becomes information about the system.
The key distinction is that ESFT does not encourage therapists to focus on themselves for their own benefit during treatment. Instead, self-awareness is used to better understand what is happening in the family. The therapist’s internal experience becomes another assessment tool.
When therapists understand their growth edges, they become better able to recognize when they are drifting away from the model and toward self-protection. They learn to ask:
- What is being evoked in me right now?
- What am I feeling compelled to do?
- Would that intervention help the family or just reduce my own discomfort?
- What might my own reaction teach me about the family’s experience?
These questions transform therapist activation into clinical information.
Over time, therapists develop greater capacity to tolerate uncertainty, maintain curiosity, and remain connected to the family even during difficult moments. They learn that the goal is not to avoid activation but to recognize it, understand it, and use it in service of treatment.
Ultimately, ESFT teaches that the therapist is both an instrument of change and a participant in the system. Growth occurs when clinicians learn to work at the edge of their competence while remaining grounded in the model. The Person of the Therapist framework provides a roadmap for understanding how our own experiences influence our work, while the concept of isomorphism helps us recognize that what is happening inside of us may be reflecting what is happening within the family.
When used thoughtfully, these moments become opportunities—not obstacles. They help therapists strengthen their capacity to join, assess, understand, and respond. In doing so, they move closer to the ultimate goal of ESFT: using every part of the system, including ourselves, in service of healing and lasting relational change.