The Kawa Model: A Japanese OT’s Perspective

By Hiroemon · Last updated: 2026-08-02

I’m a licensed occupational therapist practicing in Japan, and I have used the Kawa model in my own client interviews and assessments. That gives me an odd vantage point: I work in the country where the model was born, surrounded by colleagues who almost never use it. Most English-language explainers describe the model from the outside; this guide — part of OT Japan — describes it from the inside.

One thing to be clear about before we start: this is an independent explainer by one practicing clinician. I have no affiliation with the model’s developers or with kawamodel.com, and nothing on this page is an official or certified resource — the primary sources are listed in the references section near the end. More about me and this site is on the about page.

What Is the Kawa Model?

The Kawa model is an occupational therapy framework developed by Michael Iwama together with Japanese clinicians and presented in full in his 2006 book The Kawa Model: Culturally Relevant Occupational Therapy (Churchill Livingstone Elsevier). Kawa (川, river) is simply the Japanese word for river. The model invites the client to picture their life as a river flowing from birth toward the future, and to describe everything currently shaping that life as features of the river.

What makes it unusual among OT models is where it starts. Rather than fitting the client into predefined constructs, the therapist asks the client to draw their own river and to say what each rock, log, and wall means to them. The drawing itself is the assessment — and the client, not the therapist, is the authority on what it shows.

The metaphor has five working parts:

• Water — mizu (水, water) is the person’s life energy: the flow of daily life itself. When water moves freely, life feels like it is going somewhere; when the flow thins or stops, so does the sense of living well.
• River walls and bottom — kawa no sokuheki (川の側壁, river side walls) and kawa no zoko (川の底, river bottom) are the social and physical environment: family, colleagues, workplace, institutions, systems. They give the channel its shape — widening, narrowing, or pressing against everything in the water.
• Rocks — iwa (岩, rocks) are circumstances the person experiences as problems: illness, impairment, loss, conflict. A rock obstructs most where it sits against walls or other elements, which is exactly how disability behaves in real life.
• Driftwood — ryūboku (流木, driftwood) stands for personal attributes and resources: values, character, skills, money, relationships. Driftwood is deliberately ambivalent — it can snag against a rock and make a blockage worse, or strike a channel open.
• Spaces — sukima (隙間, spaces or gaps) are the openings between rocks, driftwood, and walls where water still flows. The spaces are where occupational therapy works: widen them, and life flows more strongly.

Two ideas follow from this picture. First, therapy is about maximizing flow, not simply smashing rocks: sometimes the wall can move (a family conversation, a workplace adjustment), or a piece of driftwood can be repositioned (a skill redeployed), even when the rock itself will not shrink. Second, no element means anything in isolation — a rock only blocks in relation to walls and water, and water only flows in relation to everything else. That relational way of thinking is the model’s cultural signature, which brings us to where it came from.

The Cultural Context Behind the Model

Iwama, a Japanese-Canadian occupational therapy scholar, found while working with occupational therapists in Japan that his Japanese colleagues struggled with the imported theories — not, he stresses, because of any lack of ability. “The problem was occupational therapy theory was developed in the Western world,” he said in a later interview, adding that “it wasn’t their lack of intelligence that was the problem.” The frameworks assumed a self that Japanese clinical reality kept contradicting.

Most Western models premise an autonomous individual who names personal goals and acts on the environment to achieve them. Much of Japanese social life runs on concepts that this premise has no slot for. One is wa (和, harmony) — the felt state of a group being in balance, which can matter more than asserting an individual preference. Another is ba (場, place or shared context) — the idea that who you are legitimately shifts with the setting you are in, so a person is one self at the family dinner table and another at the morning meeting, and neither is false. For a client whose priorities are relational in this way, an interview that opens with “What do you, the individual, want?” can simply fail to connect.

The river entered the model from the Japanese side. As recounted in the model’s Wikipedia entry, Iwama had imagined a diagram of boxes and arrows, while his Japanese colleagues “envisioned the river” — an image tied to a felt continuity between people and nature, and to a view of life familiar to every Japanese listener from, for example, Misora Hibari’s beloved song “Kawa no Nagare no Yō ni” (“Like the Flow of the River”). In the Kawa picture there is no separate “self” box at all: the person is the whole river, and well-being is harmony among all of its elements.

How the Kawa Model Is Used in Practice

In my own practice I use the Kawa model as an interview and assessment complement, not a replacement for standardized tools. It earns its place in the first conversations with a client, when the real task is to understand how this person sees their life — and it works because drawing a river is easier than answering “What are your goals?” The basic sequence I follow looks like this:

1. Introduce the metaphor in a sentence or two: your life is a river; let’s look at what is in it right now.
2. Draw the river together. Some clients draw freely; with others I hold the pen and draw what they describe, checking each element as I go.
3. Name the elements. The client decides what counts as a rock, what is driftwood, and where the walls press in — the labels are theirs, not mine.
4. Find the spaces. Where is water still flowing? The spaces, not the rocks, are where occupational therapy has something to offer.
5. Return to the drawing later in the course of therapy: a re-drawn river shows change in a way a re-administered questionnaire rarely does.

Here is what that can look like — as a fictional, generalized composite, not a real client: a man in his seventies on a recovery ward after a stroke. His rocks are right-sided weakness and a fear of falling; his walls narrow where an apartment with steep stairs meets a wife with health problems of her own. His driftwood is forty years as a carpenter — at first a liability, because he refuses craft activities as beneath his skills — until it is treated as an asset, and grip and standing tolerance are rebuilt through small woodworking tasks. The space nobody had noticed: he can still teach, and showing a younger volunteer how to plane a board becomes the activity that restores flow.

Two honest caveats. The model produces no score and no norms, so it complements rather than replaces standardized assessment. And it takes time: the research literature describes it as more time-intensive than simpler quantitative measures, and as demanding abstract thinking from both client and clinician (Ober et al., 2022). In my experience that time is usually repaid in the quality of the goals that come out of it.

How Is the Kawa Model Received in Japan?

This is the question outside overviews cannot answer, and the reason this page exists. The short version: the Kawa model was born in Japan, is quietly kept alive here by a small community — and is otherwise strikingly absent from the country’s clinical mainstream.

Born in Japan, 1999

The model emerged in 1999 from discussions among practicing Japanese occupational therapists. kawamodel.com describes it as “created by a team of occupational therapists in Japan led by a Japanese-Canadian occupational therapy scholar.” Iwama brought a draft in the Western idiom — boxes and arrows — and the Japanese members proposed the river instead. The theory that would travel the world as Japan’s contribution to occupational therapy began, quite literally, as a Japanese counter-proposal to a Western diagram.

Japan has not ignored the model entirely. A Japanese translation of the 2006 book, 川モデル―文化に適した作業療法 (Miwa Shoten, 2014, in Japanese), is in print, and a Japanese OT journal ran feature articles on the model in 2015 — including a report by Okuda and Koyama describing sixteen years of continuous use in case study meetings and student supervision, and a cross-disciplinary study network that came to include physical therapists. The founding community, in other words, never stopped.

Raised abroad: the paradox in the literature

Now compare that quiet domestic life with the model’s life overseas. A 2022 scoping review in the Open Journal of Occupational Therapy (Ober, Newbury, & Lape) found research on the model “still relatively sparse” but spreading: its thirteen included studies and the practice reports around them span ten countries, from the United States and the United Kingdom to Turkey, Malaysia, and South Africa, in contexts from mental health practice to interprofessional collaboration. The review also relays a striking figure: the model “is used in practice across six continents and is taught in over 500 OT programs around the world” (Iwama, 2018, as cited in Ober et al., 2022). Iwama himself has said the model is “starting to really pick up in America and Canada.”

And the birthplace? Not one of the review’s thirteen included studies was conducted in Japan; the only Japan-related work it cites is a critical examination of the model. Japan has more than 118,000 licensed occupational therapists (WFOT, 2025) — and in my own thirteen-plus years across physical rehabilitation, geriatric and dementia care, and mental health, I have almost never seen a colleague use the Kawa model, cite it in a team meeting, or bring it up over lunch. A framework our own clinical culture produced is, in that culture, nearly invisible.

Why the silence? A view from the clinic floor

There is an air in Japanese rehabilitation that I have felt for my whole career: the unspoken sense that doing rehabilitation means running the program — the exercises get delivered, the schedule gets filled, and the question of what all this training is for quietly recedes. The remarkable thing is that this is not just one therapist’s impression. Japan’s Ministry of Health, Labour and Welfare said almost exactly this in its 2015 report on community rehabilitation for older adults (report PDF, in Japanese):

“Training itself has become the goal, and functional training is carried out aimlessly, without timely and appropriate rehabilitation based on a plan with defined goals and time frames.” (my translation)

“Is it not the case that rehabilitation biased toward physical function is being carried out, and that balanced rehabilitation to improve overall life functioning — ‘activity’ and ‘participation’ — has still not taken hold?” (my translation)

When the national ministry describes your field’s daily reality as aimless functional training, the absence of a reflective, life-first framework like the Kawa model stops looking like an accident. Why would a tool for asking “where is this life trying to flow?” thrive in a culture the government itself describes as running programs for their own sake?

In my view, two structural facts complete the explanation — and I stress that what follows is my reading, not an established research finding. First, Japanese rehabilitation is billed in twenty-minute units — tan’i (単位, billing unit) — and a therapist’s day is counted in them. A dialogue-first, drawing-based tool with no billing code of its own fits awkwardly into a schedule measured that way; the international literature already flags the model as time-intensive even without Japan’s unit system on top.

Second, the institutional slot the Kawa model might have occupied is already taken. The Japanese Association of Occupational Therapists developed and organizationally promotes its own framework: MTDLP — seikatsu kōi kōjō manejimento (生活行為向上マネジメント, Management Tool for Daily Life Performance) — with a dedicated office, an instructor system, and a national training structure behind it. MTDLP answers the same national call for a shift toward activity and participation, so, in my view, the association’s energy flows there, and little institutional room is left for a framework with no organization pushing it. Add Iwama’s own diagnosis — that Japanese therapists found imported theory alienating in the first place — and I would argue the Kawa model ended up filed in the very drawer Japanese clinicians open least: theory.

Where the river still flows: Bethel House

One Japanese connection deserves more attention than it gets, and it requires a short detour to explain — which is precisely why you will not find it in overseas summaries. Bethel House (浦河べてるの家, Urakawa Bethel no Ie) is a community activity center founded in 1984 in the small town of Urakawa in Hokkaidō, run with and by people living with psychiatric disabilities. It is the birthplace of tōjisha kenkyū (当事者研究, self-directed peer research) — a practice begun there in 2001 in which people research their own difficulties together with peers, treating their symptoms as material for shared study rather than as private shame. Bethel is one of the most original things Japanese mental health has produced, and its spirit — the person as the researcher of their own life — is strikingly close to the Kawa model’s premise that the client is the authority on their own river.

The two have in fact met. In their 2015 journal report, Okuda and Koyama describe a 2014 seminar at the University of Tokyo where Bethel House members worked with the Kawa model, and characterize it as functioning there as a tool for talking about everyday life across differences of age, position, and nationality. To me this is the most hopeful data point in the model’s whole Japanese story: when it found Japan’s own peer-led recovery culture, it worked exactly as designed.

Why Japan Still Needs the Kawa Model

Everything above could read as an obituary. I mean it as the opposite: the same structural facts that explain the model’s absence are, to me, the argument for bringing it home. Four reasons.

1. For clients who will not say what they want. In Japanese clinics, a direct “What are your goals?” can be met with silence, or with polite deferral to the professional. A small qualitative study of therapists using the model in mental health practice (Paxson et al., 2012 — two therapists, so read it as exploratory) reported that the river metaphor served as a culturally neutral platform for open dialogue, improving engagement and rapport. That is exactly the mechanism a self-effacing clinical culture needs: the river lets people say indirectly what they would never announce directly.

2. It points the same way as national policy. The ministry’s prescription — away from aimless functional training, toward activity and participation — is precisely what the Kawa drawing operationalizes: body function (rocks), environment (walls), personal resources (driftwood), and the flow of a whole life (water) on a single sheet of paper. The model is not a foreign luxury at odds with Japanese policy; it is a concrete way of doing what the policy already asks.

3. A common language for teams. In a small pilot study at a US skilled nursing facility (Lape et al., 2019), nine of ten multidisciplinary staff members — 90% of a ten-person sample — said the model would be an effective tool for enhancing collaboration, and all ten agreed it provided a common language across professions. In my view that maps directly onto Japan’s interprofessional care conferences, where medical, nursing, and care staff routinely talk past each other for want of a shared picture.

4. The therapist’s own river. The model has also been reported as a self-reflection tool: Tripathi and Middleton (2018) described using it with occupational therapy students to plan and measure their own professional development. I would extend the invitation to every Japanese therapist whose days are counted in twenty-minute units: draw your own river once, and see where your water is actually flowing. The exercise the system never bills for may be the one the workforce most needs.

I will end where I began — in the interview room. When I have brought the river into my own assessments, the conversation changes register: we stop auditing deficits and start talking about a life, and clients who had nothing to say about “goals” turn out to have a great deal to say about their rocks and their water. The Kawa model grew out of Japanese clinical conversation. It deserves to flow back into it.

Kawa Model Resources & Key References

Primary sources first, then the research cited in this article. The Kawa Model Made Easy manual is distributed free by its authors for noncommercial use; I link to it rather than re-hosting it.

• Iwama, M. K. (2006). The Kawa Model: Culturally Relevant Occupational Therapy. Churchill Livingstone Elsevier. Publisher page
• Teoh, J. Y., & Iwama, M. K. (2015). The Kawa Model Made Easy: A Guide to Applying the Kawa Model in Occupational Therapy Practice (2nd ed.). Free PDF from kawamodel.com
• kawamodel.com — the resource hub maintained by the model’s originators: lectures, research, and case material.
• Ober, J. L., Newbury, R. S., & Lape, J. E. (2022). The Dynamic Use of the Kawa Model: A Scoping Review. The Open Journal of Occupational Therapy, 10(2), 1–12. Open access
• Paxson, D., Winston, K., Tobey, T., Johnston, S., & Iwama, M. (2012). The Kawa Model: Therapists’ Experiences in Mental Health Practice. Occupational Therapy in Mental Health, 28(4), 340–355. Abstract
• Lape, J. E., Lukose, A., Ritter, D. R., & Scaife, B. D. (2019). Use of the Kawa Model to Facilitate Interprofessional Collaboration: A Pilot Study. The Internet Journal of Allied Health Sciences and Practice, 17(1), Article 3. Open access
• Tripathi, N. S., & Middleton, C. (2018). Using the Kawa Model for Self-Assessment in Continuing Professional Development. OT Practice, 23(17), 12–16. (AOTA member magazine; no public full text.)
• Stein, F. (interviewer). 20Q: The Kawa Model of Occupational Therapy Developer — interview with Michael Iwama. occupationaltherapy.com
• Iwama, M. K. (2014). 川モデル―文化に適した作業療法 (Japanese translation by Matsubara, Shimizu, & Miyaguchi). Miwa Shoten. Bookstore page (in Japanese)
• Okuda, M., & Koyama, K. (2015). 川モデルの実践 ―16年間の歩みから [Practicing the Kawa model: sixteen years on]. Sagyō Ryōhō Jānaru (作業療法ジャーナル), 49(10), 1030–1033. Abstract (in Japanese)
• Ministry of Health, Labour and Welfare (2015). 高齢者の地域における新たなリハビリテーションの在り方検討会報告書 [Report of the study group on new approaches to community-based rehabilitation for older adults]. PDF (in Japanese)
• Japanese Association of Occupational Therapists. What is MTDLP? (in Japanese) · Bethel House: bethel-net.jp (in Japanese)

Frequently Asked Questions

Is the Kawa model evidence-based?

It has a growing but still modest research base. A 2022 scoping review described research on the model as still relatively sparse. Studies to date report benefits for client engagement, rapport, and team collaboration, along with barriers such as time demands and the abstract thinking the model asks of novice users. The Kawa model is best understood as a conceptual framework and assessment complement rather than a standardized outcome measure, so it should be judged by different criteria than a protocolized intervention.

Can I use the Kawa model outside Japan?

Yes — outside Japan is where it is used most. According to figures cited in the 2022 scoping review, the model is used in practice across six continents and taught in over 500 occupational therapy programs, and its developers frame it as culturally relevant rather than Japan-specific: clients are encouraged to reshape the river metaphor until it fits their own view of life. The free Kawa Model Made Easy guide (Teoh & Iwama, 2015) is a practical starting point.

How is the Kawa model different from MOHO?

The Model of Human Occupation (MOHO) explains occupation through defined universal constructs — volition, habituation, performance capacity, and environment — and offers a family of standardized assessments. The Kawa model works in the opposite direction: it starts from the client’s own river metaphor and lets the concepts take whatever shape the client gives them, with no fixed constructs or scoring. In my view they can complement each other: MOHO brings structure and measurement, while the Kawa model offers a culturally flexible way into the conversation.