🔍 Module 2 — Who Are Kieron O'Connor and Frederick Aardema? | I-CBT Course
- Jul 27
- 6 min read
Free Course by Everything IFS Academy | Therapeutic Modalities Series
Module 2 — Who Are Kieron O'Connor and Frederick Aardema?
Inference-Based Cognitive Behavioral Therapy has two creators, not one, and the approach is unimaginable without either of them. Kieron O'Connor and Frederick Aardema were researchers working in Montreal when they began paying close attention to something every other model of OCD had filed away as noise: the reasons. People with OCD did not just have strange thoughts. They had thoughts that arrived carrying arguments, and the arguments were often clever. Nearly everyone else in the field looked past that detail. These two built an entire therapy on it.
The Problem They Were Responding To
To understand what O'Connor and Aardema did, it helps to see what the field believed when they started.
By the 1990s, the reigning view held that intrusive thoughts are random mental events. Research had shown that nearly everyone has odd, unwanted thoughts from time to time: a flash of shoving a stranger on a subway platform, a sudden image of swerving the car. Under that view, the thought itself was meaningless static, and OCD began afterward, in how a person reacted to the static. Treatment therefore worked downstream of the thought. One tradition helped people face their triggers and let the anxiety fade on its own. Another helped people correct the catastrophic meaning they attached to the intrusion. Both traditions helped many people, and both left the thought's arrival itself unexamined, because there was nothing to examine. Random is random.
Except that was not what O'Connor and Aardema kept seeing in the clinic. Two observations would not leave them alone.
The first: their clients reasoned beautifully. A man who spent two hours a night checking his stove could run a department, weigh evidence, and make sharp judgments all day long. His reasoning was not broken. It malfunctioned in one place only, inside the obsession, and worked impeccably everywhere else. A general defect should not respect boundaries like that.
The second observation was the decisive one: the obsessional doubt never arrived alone. It arrived already justified. Ask a client why the stove might still be on, and they did not shrug and say the worry came from nowhere. They had reasons: appliances malfunction, memory is fallible, there was a news story about a fire, a cousin once flooded an apartment. The doubt showed up with a case already prepared, like a lawyer who walks in with the briefcase packed.
Put those two observations together and the "random static" picture stops holding. A random event does not come with arguments attached. A produced event does. The doubt, they concluded, was not landing on these people out of nowhere; it was being generated, actively and skillfully, by a reasoning process that could be studied. And if the doubt was produced by reasoning, then reasoning was where a therapy could intervene. That single inference is the seed of everything this course teaches.
Building the Model
Turning a clinical observation into a treatment with evidence behind it took the better part of two decades.
The main milestones:
The Montreal research program. Through the 1990s, working out of a psychiatric research centre affiliated with the Université de Montréal, O'Connor and colleagues studied the reasoning of people with OCD directly, examining how obsessional doubts were constructed and justified rather than treating them as meaningless events. O'Connor brought a long-standing research interest in reasoning and inference processes; Aardema, a Dutch-born researcher who joined the Montreal group, became the model's co-architect and pushed its understanding of how the doubts connect to a person's sense of self.
The formalization of the inference-based approach.
The scattered observations hardened into a full clinical model: OCD as a disorder of doubt, the doubt as a faulty inference, and a structured therapy for resolving it. The approach was known in its early years as inference-based therapy, or IBT, before the fuller name I-CBT took hold.
Beyond Reasonable Doubt (2005).
The book-length statement of the model, written by O'Connor and Aardema with colleague Marie-Claude Pélissier. The title is a small masterpiece: it names the legal standard of proof while pointing at doubt that has traveled beyond anything reasonable.
The clinician's handbook.
A later treatment manual by O'Connor and Aardema translated the model into a structured, step-by-step program that therapists anywhere could deliver, which is what allowed the approach to spread beyond Montreal.
The randomized controlled trials.
Over the years, the approach was tested in randomized controlled trials, the strictest standard in treatment research, where it showed effectiveness comparable to the established treatments for OCD. This mattered enormously: a clever theory is easy to publish, and a treatment that holds up in trials is another thing entirely.
The Partnership and the Legacy
The two men made an effective pair precisely because they came at the problem from different angles. O'Connor was the senior figure, a British-born psychologist whose career spanned OCD, tics, and body-focused disorders, with a deep interest in how people reason their way into conviction. Aardema's work increasingly illuminated the personal side of the equation: why a doubt grips one person and slides off another, and what the content of an obsession reveals about the self a person fears being. That second thread became one of the most distinctive parts of the model, and it has its own lessons later in this course.
Kieron O'Connor died in 2019. He worked essentially until the end, and by then the approach he had co-created had traveled from a single Montreal research centre into an international movement. Frederick Aardema has carried the model forward since: leading the research program, running new trials, refining the treatment, and building the training resources through which a growing worldwide community of I-CBT therapists now learns the approach. The model is not a museum piece; it is an active, developing line of research with new studies appearing regularly.
The reason this history belongs at the start of a skills course is simple. Every technique in the modules ahead is the practical descendant of that original observation in the clinic: that the doubt arrives with reasons, and that reasons can be answered. When the course examines a doubt's justifications, traces where it crossed away from reality, or weighs it against the evidence of the senses, it is doing exactly what two researchers in Montreal decided to take seriously when the rest of the field called it noise.
Below this lesson, you'll find an I-CBT practice built around one of the skills you just learned, along with a few ways to begin noticing and practicing it in everyday life this week.
I-CBT Practice: The Founding Observation, Run on Your Own Life
O'Connor and Aardema's model began with two observations about their clients. This practice invites you to make both observations about yourself.
Take about five minutes with a piece of paper.
Draw a line down the middle of the page. Title the left side "Where my reasoning works."
On the left, list three or four areas of your life where you judge, decide, and reason well: your work, managing money, reading people, solving everyday problems. Give yourself honest credit; this column is evidence, not flattery.
Title the right side "Where doubt takes over." List the one or two situations where doubt tends to grab you: the checked lock, the re-read message, the replayed conversation.
Now make the second observation. Pick one doubt from the right column and ask: when it shows up, does it come empty-handed, or does it bring reasons with it? Jot down one or two of the reasons it usually brings, word for word if you can.
Finish by writing this sentence at the bottom and completing it in your own words: "My reasoning works well almost everywhere. The doubt shows up already argued, in this one place: ___." That sentence is the founding observation of I-CBT, written about you, and the rest of this course is built to answer it.
This Week
The next time a familiar doubt fires, see if you can catch one of the reasons that arrives with it, just noticing it, the way you'd notice an accent.
Pick one moment this week when you made a sound, quick judgment about something ordinary, and let yourself register that your reasoning did that.
If you're curious, look up Beyond Reasonable Doubt and simply read its full title slowly. It says more about this therapy than most summaries do.
Disclaimer:
Everything IFS Academy is an independent educational platform and is not affiliated with, endorsed by, or connected to the IFS Institute. While we strive for accuracy, errors can occur, and users are encouraged to cross-reference critical information. These courses, lessons, skills, and practices are offered for educational and self-reflection purposes only. They do not constitute therapy, mental health treatment, clinical training, or crisis support, and they should not be used as a substitute for professional mental health care.
Crisis Support: 🚨
If you are experiencing a mental health crisis, feel unsafe, feel at risk of harming yourself or someone else, or feel too overwhelmed to safely use self-directed practices, please pause this material and reach out for immediate support. Contact a licensed mental health professional, call or text 988 in the U.S. or Canada, or use your local emergency or crisis resources.
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