Functional Contextualism in Primary Care Behavioral Health: What Is This Behavior Doing?

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A post in the Clinical Foundations Series.

When Hercule Poirot begins an investigation, his colleagues invariably want to examine the physical evidence—the cigarette ash, the fingerprint, the stopped watch. Poirot lets them. Then he does something else. “Me, I am not one to rely upon the expert procedure,” he tells a skeptical companion in Murder on the Orient Express by Agatha Christie. “It is the psychology I seek, not the fingerprint or the cigarette ash” .

Poirot is worth a moment’s introduction. He is Belgian, born near Spa in the Ardennes, from a large family of modest means, Catholic by upbringing, and active in the Brussels police force from at least 1893, where he eventually rose to Chief of Police. He came to England during the First World War not simply as a refugee but as a wounded veteran, invalided out after the Somme, and never quite left. He speaks French natively, and the English passengers who surround him on the Orient Express consistently assume he is French—an assumption he tolerates with barely concealed irritation. He is Belgian, and the distinction matters to him.

What matters more, for our purposes, is what he does with the way he is perceived. He has an egg-shaped head, an elaborately upward-curled moustache, and a method that strikes almost everyone as backwards. He is also entirely aware that he reads as ridiculous, and he exploits it deliberately, leaning into his foreignness, exaggerating his broken English, performing the role of the fussy little man who couldn’t possibly be worth taking seriously. People let their guard down around someone they have already dismissed. The outsider, misread at every turn, has learned to attend to what things do rather than what they appear to be. Unable to rely on the default assumptions of the room, he asks different questions.

Mary Debenham, catching her first glimpse of him on a freezing platform, sees “a ridiculous-looking little man. The sort of little man one could never take seriously” . She is not alone in this assessment. She will be wrong, as everyone is—because his context shaped his questions. That, in a sense, is the argument of this post.

Miss Debenham, orderly and efficient, finds his method frustrating. When Poirot asks not what she observed but what she felt, she objects: “Whether or not I liked Mr. Ratchett’s face does not seem likely to be helpful in finding out who killed him” . Poirot is unmoved. The physical clues in this case are nearly useless—planted, contradictory, designed to mislead. The only thing that holds is psychology: what each person was doing, and why, and in what context.

Behavioral health consultants face a structurally similar problem every day. The presenting complaint—the diagnostic label, the PHQ-9 score, the chief concern written in the chart—is the cigarette ash, which tells you something but rarely enough. The question that unlocks the clinical encounter is not what does this patient have but what is this behavior doing? Call it the functional question. Readers of this blog have met it already, in the BHC as Mentat, in What the Substance Is Doing, and in the Contextual Interview as it applies to substance use. It will keep returning in posts on warm handoffs, chronic disease management, and trauma, because it is less a technique than the orientation that makes every other technique useful. This post explains where it comes from: a philosophical framework called functional contextualism, the foundation of the Primary Care Behavioral Health model.

The Problem with Categories

Diagnosis has genuine utility. A DSM or ICD category coordinates communication, guides research, and signals something about likely presentation and course. It carries legal and administrative weight: it triggers referral pathways, determines eligibility for certain services, and shapes how a patient’s chart follows them through a system. In the practical world of integrated primary care, it is also simply a billing requirement—without a documented diagnosis, services cannot be reimbursed, and a position that cannot justify its billing is a position that will not survive. No thoughtful clinician discards diagnosis entirely, and none should.

The problems arise in two distinct ways, both worth naming even if a full treatment belongs in a future post. The first is when diagnosis becomes a clinical endpoint—when arriving at a category feels like the work is done, and the category itself substitutes for understanding what is actually happening for this patient. The second is subtler and in some ways more corrosive: when administrative or billing pressures drive the diagnostic choice. When reimbursement criteria, payer requirements, or documentation demands push a clinician toward the most billable or most defensible category rather than the most clinically accurate one, the diagnostic label is no longer even doing its descriptive job. It is doing an administrative job, and the patient’s actual functional presentation recedes further from view. Both failure modes share the same structure: the category stops being a tool and starts being the answer.

Kirk Strosahl, one of the architects of both the PCBH model and Acceptance and Commitment Therapy, described the problem this way in a 2016 interview with Bridget Beachy and David Bauman: the move into primary care forced a different way of seeing. “It isn’t defined by the category that they’re in,” he said of the suffering he encountered. “They’re things that sweep across the human landscape” . What Strosahl encountered was suffering that arrived without the taxonomy intact—chronic pain alongside depression alongside avoidance alongside relationship dissolution, none of it neatly bounded, all of it contextually intelligible once you asked the right question.

Steven C. Hayes, whose foundational work on functional contextualism underlies both ACT and the PCBH model, made a similar observation more recently. The categorical approach, what he calls the top-down normative model, has a structural flaw rather than a merely practical one. “The DSM is a dead man walking,” he told Beachy and Bauman in 2024. “We haven’t discovered even a single disease” . The implication is not that diagnostic categories are worthless but that they were never designed to answer the question the clinician most needs answered: what is happening here, for this person, in this moment, and what does it serve?

What Functional Contextualism Actually Is

Functional contextualism is a philosophy of science, not a clinical technique, and the distinction matters more than it might appear. Techniques can be borrowed, applied, and discarded. A philosophy of science shapes what questions you think are worth asking in the first place.

The framework has its roots in the American pragmatist tradition. Stephen Pepper‘s 1942 World Hypotheses mapped the major philosophical “root metaphors” that underlie different ways of understanding the world. Contextualism’s root metaphor is the act-in-context: the ongoing event, always embedded in its historical and situational surround, that cannot be fully understood in isolation from either . Pepper’s formulation is precise—the root metaphor is not simply “context” in the loose sense of background conditions, but the act as it is being done: hunting, or cooking, or making love. An event abstracted from its doing is no longer the same event. A behavior does not exist independently of the moment in which it occurs, the history that shaped it, and the environment that maintains it. Pull it out of context and you have a description. Leave it in context and you can begin to ask what it is doing.

Hayes and Brownstein formalized this for behavioral science, making an argument that is easy to underestimate. They distinguished between two goals a science might pursue: description and prediction-and-influence. Description aims to accurately represent what something is—to classify it, name it, fit it into a taxonomy. Prediction and influence aim to understand behavior well enough to anticipate it and, where useful, to change it. Because these are different goals, they call for different kinds of account. A science oriented toward description needs taxonomies. A science oriented toward prediction and influence needs functional accounts—accounts of what behavior does in context—because only those accounts specify what can actually be manipulated to produce change .

This distinction has immediate clinical force. The preceding post in this series argued that the biopsychosocial model is clinically inert at the point of intervention: it names the domains to consider without specifying what to do. Hayes and colleagues identified the same structural problem in cognitive theories of psychopathology: frameworks built around description and classification are, in their terms, “independent variable free.” They tell you what the phenomenon looks like without telling you what can be changed to alter it. Functional contextualism is built to close that gap. It does not replace the biopsychosocial framework so much as operationalize it; the BPS model names the domains, and the functional question asks what is happening within and across them, in this patient, right now, in a way that generates the next clinical move.

A diagnostic label is a descriptive achievement. “Alcohol use disorder, moderate severity” tells you something real about a patient’s presentation. It tells you relatively little about what the drinking is doing—what it regulates, what it makes possible, what it costs, what has sustained it across years of intermittent attempts to stop. Two patients can carry identical diagnoses while their drinking serves entirely different functions. For one, alcohol is the only available anesthetic for a chronic pain condition that has never been adequately treated. For another, it is the primary social lubricant in a relationship network where abstinence would mean isolation. For a third, it is an avoidance strategy that keeps a decades-old trauma history from surfacing in any form that requires confrontation. Same description, three functions, and an intervention that works for one may do nothing for the other two.

The truth criterion follows from this, and it is easy to misread. In functional contextualism, what is true or false is an account, not a behavior. Hayes and Brownstein , drawing on Pepper, call the criterion “successful working”: a term, concept, or statement of a relation is not true or false according to its correspondence with some underlying structure, but according to its impact on dealing successfully with the phenomena of interest. For the clinician, that means a formulation earns its place by what it lets you do next.

The patient’s behavior is held to a parallel standard. ACT carries the same pragmatic logic into the clinical room as workability; Hayes and colleagues describe ACT as emphasizing “workability as a truth criterion, and chosen values as the necessary precursor to the assessment of workability because values specify the criteria for the application of workability.” The drinking is not a symptom of a disorder that exists independently of what the drinking does. It persists because, in the short run, it works: it achieves something the person needs achieved, however costly the method. Whether it is workable is a separate question, answerable only against what the person cares about. None of this is a moral judgment or a claim that the behavior is adaptive over the long run. It is a claim about function, and function is where effective intervention starts. The clinical question becomes less “how do we stop this behavior” than “what is this behavior accomplishing, and how do we help this person accomplish that another way, or reconsider whether the goal itself is workable?”

To return to the alcohol use example: a patient who drinks to regulate anxiety in social situations where she has no other available coping strategy is not failing to respond to treatment. She is succeeding at anxiety regulation by the only reliable method currently in her repertoire. A straightforward recommendation to attend AA meetings addresses the behavior without addressing the function. It may produce short-term abstinence and reliable relapse, because the goal the drinking accomplished has not been addressed and the person has no substitute means of accomplishing it. A functional account—”this patient drinks to regulate social anxiety in the absence of other coping strategies”—is a better clinical account not because it is abstractly truer, but because it generates the next move. It tells you what to target, what capacities need to be built, and what the likely failure mode of any intervention that ignores the function will be. That difference separates two questions: what is this? and what is this doing, for whom, in what context, and toward what end?

The Functional Question in Practice

The functional question—what is this behavior doing?—is deceptively simple. It reorients the clinician’s attention from form to function, from topography to context. Identical PHQ-9 scores and identical symptom profiles can describe behavior that serves entirely different functions. In one patient, withdrawal and anhedonia protect against the anticipated pain of rejection in a relationship already fracturing. In another, they are the downstream consequences of chronic sleep deprivation and inadequate pain management. Treat the two alike and at least one of them will be treated for the wrong thing.

The functional question also cuts across diagnostic categories in a way that makes it particularly well-suited to primary care. Strosahl put it plainly: ACT simplifies “the question of what do you do when you see all these different kinds of suffering and you have limited time” . The BHC who carries the functional question fluently does not need a different conceptual framework for each presenting problem. The question stays the same from one presenting problem to the next; only the answer changes.

Hayes, reflecting on a lifetime of developing and disseminating ACT, described the aspiration this way: “When you shift from signs and symptoms to biopsychosocial processes of change, you can step up to this challenge of the five out of five” . The five out of five is a claim about scope: if the relevant processes are transdiagnostic, if what matters is not which category a patient falls into but which functional patterns are driving their distress, then the model becomes scalable in a way that categorical approaches cannot be.

That is the practical argument for functional contextualism in primary care. The philosophical argument is that it is also simply more accurate—that human suffering does not arrive pre-sorted by DSM or ICD category, and a clinical framework that proceeds as if it does will misunderstand most of what it sees.

Contrast with Topographical Thinking

The alternative deserves to be named directly, because topographical thinking is the default mode that training instills and that primary care culture can inadvertently reinforce.

Topographical thinking attends to the form of behavior—its observable features, its categorical membership, its symptom profile. The topographic question is: what does this look like? The topographic answer produces a label. Labels coordinate care and communication, but they do not, by themselves, generate effective intervention.

The risk is not that topographic thinking is wrong—it is that it can be sufficient. A BHC who identifies depression, initiates behavioral activation, and monitors PHQ-9 scores has done something recognizable and defensible. The PHQ-9 may even improve. But if the depression is functioning as the patient’s primary means of signaling distress in a relationship where direct communication has never felt safe, behavioral activation will bump against that function at every turn. The clinician will find the patient non-adherent, unmotivated, resistant, when what the patient is actually doing is protecting something that matters to them. The functional question would have found that faster.

Miss Debenham’s objection to Poirot is the topographic objection: stick to the facts, stay with what is observable, do not introduce the soft and unreliable evidence of psychology into a hard problem. Poirot’s response is the functional response: the facts do not speak for themselves. They require a context, a why, a function, before they make sense.

Functional Contextualism and the PCBH Model

The connection between functional contextualism and the PCBH model runs deeper than shared vocabulary. Robinson and Reiter ground the model in a population-based, functional approach to care—one that asks, for every patient and every encounter, what this person needs in this context, and what the behavioral health consultant can do in the time available to move toward that. The functional question sits at the spine of the model’s assessment approach rather than alongside it.

This is part of what Strosahl meant when he described ACT as inextricably linked to his experience in primary care . The two share a philosophical substrate and a clinical stance, and in both the question is always functional.

That said, functional contextualism is not the only route to the functional question. In my years of working in primary care behavioral health, I have watched clinicians trained in Social Learning Theory, Adlerian psychology, psychodynamic traditions, humanistic and existential frameworks, and strict behavioral approaches all arrive at structurally similar clinical stances—attending to context, asking what behavior accomplishes, resisting the pull of the label as endpoint. The theoretical languages differ, but the clinical orientation converges. What the PCBH model asks for is less a philosophical allegiance than a willingness to ask what is actually happening for this person, in this context, right now, and to let that question drive the work.

Strosahl himself put it plainly when reflecting on what gets in the way of effective practice in primary care: “Most of the time the thing that gets in the way is our own assumptions and our own self-imposed limitations” . Assumptions, he observed, “can be magnificently instructive and useful—and they can be magnificently destructive and unuseful” . This is as true of theoretical allegiances as of clinical habits. The BHC who cannot hold their framework loosely enough to ask what is actually happening will miss the functional question regardless of which tradition trained them. Functional contextualism offers one rigorous account of why that question is the right one to ask, though not the only one.

A Note on Limitations

Functional contextualism is not a guarantee of clinical effectiveness. Asking the right question is necessary but not sufficient. The functional question opens the inquiry; clinical skill, relational attunement, and evidence-based technique close it. A BHC who has absorbed the functional framework but lacks the interpersonal capacity to create a brief alliance, or the technical repertoire to translate a functional understanding into an effective intervention, will still struggle, perhaps most frustratingly, because they can see exactly what the problem is and remain unable to move it.

Consider what it actually takes for the functional question to work in a warm handoff. The BHC has perhaps twenty minutes, a patient who may not have chosen to be there, and a PCP who has just handed off someone they are genuinely worried about. The BHC does not put the functional question to the patient; it stays in the clinician’s head, waiting for enough context to answer it. That context has to come from the patient, who is being asked about their life by a stranger, under time pressure, often while still processing whatever just happened with their doctor. What they are willing to share depends on a degree of safety. Safety requires a relationship, however brief, and relationship requires something the framework cannot supply: the capacity to be present with another person in a way that feels genuine rather than procedural.

This is where the clinician’s full training—theoretical background, clinical experience, personal development—does work that functional contextualism alone cannot do. The Adlerian-trained BHC brings a particular attunement to questions of belonging and social interest. The psychodynamically-trained BHC brings a sensitivity to what is not being said. The humanistically-trained BHC brings an orientation toward the patient’s own meaning-making that can open doors a more directive approach would close. Functional contextualism supplies the question; the clinician’s depth creates the conditions under which the patient tells you enough to answer it.

The Contextual Interview—the PCBH model’s default assessment structure—was crafted with exactly this tension in mind. The CI was originally introduced by Robinson, Gould, and Strosahl as an interviewing approach anchored in four life domains: Love, Work, Play, and Health Behaviors—a snapshot of the patient’s actual life, not their presenting complaint. Cahill and colleagues extended this framework into medical education, describing the CI as “a cross-cutting, practical, time-conscious, and semi-structured patient interviewing approach that deliberately elicits information to improve the clinician’s sense and understanding of the patient’s unique social context,” and making explicit what the original framing implied: that gathering this information is not a prelude to the clinical relationship but is itself the clinical relationship in formation.

The CI does not separate assessment from relationship; it builds the relationship through the assessment. A patient who has just been asked about what matters to them, what brings meaning to their days, what their health behaviors actually look like in the context of their real life has been treated as a human being rather than a case presentation. That experience of being genuinely seen is part of what makes the functional question answerable at all.

What functional contextualism offers, then, is orientation rather than method. It ensures the clinician is working on the right problem, that the intervention is aimed at something real rather than at a label that may or may not capture what is actually happening for this person. It does not tell the clinician how to be present, how to earn trust in a few minutes, how to read the room when the patient’s affect doesn’t match their words, or how to know when to follow and when to lead. Those capacities come from somewhere else. In a 20–30 minute visit, that orientation is the condition under which anything useful can happen at all. It is still not, by itself, enough.

Later in the Clinical Foundations Series: population-based care as a clinical philosophy, and what it means to hold both the panel and the patient in the room at once.

Disclosure: This post was written by the author. Claude (Anthropic) assisted with research, drafting, and editorial refinement. All clinical content, interpretations, and recommendations reflect the author’s own professional judgment.

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