1. Why a model matters
A model of disability is not a theory you have to believe. It is a lens. Pick one up and it decides what you look at, what you call the problem, and therefore what you go and do about it.
That is the whole reason this is worth twenty minutes. Two people can look at exactly the same situation, agree on every fact, and walk away with different jobs to do, purely because they were holding different lenses. If you cannot name the lens somebody is using, you will keep having arguments that feel like they are about budgets and are really about this.
Where this list comes from: these seven are the models named in the IAAP body of knowledge for the CPACC certification, in the domain on disabilities and challenges. If you are studying for that exam, this is the material. If you are not, it is still the clearest set of lenses anyone has put together for this work.
2. One situation, nine readings
Here is the fastest way to feel the difference. One situation, and what each model says about it.
The situation. Aishath uses a wheelchair. Her local bank branch has three steps at the front door and no ramp. She has not been able to get in.
| Model | What it says is going on | So it does this |
|---|---|---|
| Moral and religious | This is a test, or a punishment, and it is not really about the bank. | Nothing to the building. Tells her to be patient. |
| Charity | Poor Aishath, how sad for her. | Sends two staff out to lift her up the steps, and feels good about it. |
| Medical | Aishath cannot climb steps because of her spinal injury. | Refers her to rehabilitation. The steps are not mentioned. |
| Economic | She is a lost customer, and there is a cost to the state. | Works out what the inaccessibility costs, and decides on that number. |
| Functional solutions | She needs to bank and cannot reach the counter. | Buys a portable ramp, or points her at the mobile app. Problem solved today. |
| Biopsychosocial | Her injury, the steps, and how she feels after being turned away twice are all part of it. | Deals with all three, including the part where she has stopped trying. |
| Social identity | She is not alone. Others have fought this and there is a community behind her. | Organises. Brings collective pressure, and expertise, to the bank. |
| Social | There are three steps and no ramp. That is the barrier. | Builds a ramp. |
| Human rights | She is entitled to reach her own money on the same terms as anyone else. | Builds a ramp, and does not treat it as a favour it was owed thanks for. |
Read that column on the right again. Only two of the nine end with the bank being usable next week without anybody having to ask for help. That is the argument in one table.
3. The medical model
What it says. Disability is a condition inside a person. It is a diagnosis, and the answer is treatment, therapy or cure.
How it sounds. "She is confined to a wheelchair." "He suffers from deafness." "We need to see whether anything can be done for her."
| What it gets right | What it gets wrong |
|---|---|
| Bodies are real, and some conditions genuinely do need treating. Pretending otherwise helps nobody. | It puts the problem entirely inside the person, so it never once looks at the step. |
| It gives clear criteria, which is how benefits, adjustments and legal protections get decided at all. | It makes people prove themselves. Endless documentation, repeated assessment, and the exhaustion that comes with it. |
| It matches how healthcare is organised, so it gets things funded. | It labels, and the labels stick. Language like "suffers from" follows people around for years. |
Where you will meet it. Every eligibility form you have ever filled in. It is not going away, and it should not, because something has to decide who qualifies for what. The failure is not that it exists. The failure is using it as the only lens, which is how you end up with a rehabilitation referral instead of a ramp.
4. The social model
What it says. People have impairments. Disability is what happens when the world is built without them in mind. The impairment is in the person, the disability is in the environment.
How it sounds. "She uses a wheelchair, and the branch has no ramp." "The video has no captions, so Deaf viewers are shut out." Notice that both sentences contain something you could go and fix this month.
| What it gets right | What it gets wrong |
|---|---|
| It moves the fault from the person to the design, which is both fairer and far more useful. | Pushed too far it can sound like impairment does not exist, or does not hurt. Some conditions are painful and would be with any building. |
| It produces work. Every barrier it names is something somebody can remove. | The clean split between impairment and disability is tidier than real life. |
| It is the foundation of disability rights, and of this whole profession. | It can imply that if you removed every barrier there would be no disability left, which is a claim many disabled people do not recognise. |
Where you will meet it. Underneath essentially all of accessibility practice, including WCAG, universal design and the CRPD. When this site says the step is the problem rather than the wheelchair, this is the model talking.
5. The biopsychosocial model
What it says. Three things interact, all the time. The biological, which is the body. The psychological, which is how a person thinks and feels about their situation. And the social, which is the environment and the people in it. You cannot understand the whole by looking at one third of it.
How it sounds. "The pain is real, the building is bad, and after two years of being told there is nothing to be done she has stopped asking. All three are keeping her at home."
Worth knowing: this is the model behind the World Health Organization's ICF, the framework used internationally to describe functioning and disability. It is the official middle ground between the medical model and the social model rather than a rejection of either.
| What it gets right | What it gets wrong |
|---|---|
| It is the most honest picture of the seven. Real situations really do have all three parts. | Trying to hold three things at once can end in a plan that does none of them properly. |
| It brings the psychological in, which the other models mostly ignore, and it matters enormously. | It has been misused to argue that a physical condition is partly attitude, which is how it can be turned against people in benefits assessments. |
6. The economic model
What it says. Disability is measured by its effect on the ability to work and on productivity. The interesting number is what it costs, to the person, to the employer and to the state.
How it sounds. "What is her capacity to work?" "What would this cost us in lost hours?" And on the better side of it, "we are turning away sixteen percent of our potential customers."
| What it gets right | What it gets wrong |
|---|---|
| Money is how organisations actually decide things, so this is the language budgets get approved in. | It measures a person by output, which is a short walk from calling them a cost. |
| It gives real evidence, such as the market you lose by being unusable. | It offers no reason to include somebody who will never be profitable to include, and there are such people, and they still have rights. |
Use it carefully, and second. The business case is genuinely useful in a board meeting, and the curb cut effect is an economic argument. But lead with rights and follow with money. A programme that exists only because it paid for itself gets cancelled the first year it does not.
7. The functional solutions model
What it says. Never mind the philosophy. There is a task the person cannot currently do. Find something that lets them do it. This model is practical, technological and deliberately uninterested in the politics.
How it sounds. "She cannot read the screen, so she needs a screen reader." "The counter is too high, so put a lower section in." Engineers love this model, for good reasons.
| What it gets right | What it gets wrong |
|---|---|
| It ships. Somebody is better off on Tuesday, which is more than most models can say. | It fixes one instance and leaves the cause alone, so the same problem appears again next door. |
| Most assistive technology exists because of this way of thinking. | It can turn a rights question into a shopping question, where access depends on who can afford the gadget. |
Where you will meet it. A portable ramp is this model. So is a screen reader, a grab rail and a captioning service. All good things. Just notice that a portable ramp kept behind the counter means somebody still has to ask, and asking is itself a barrier.
8. The social identity, or cultural affiliation, model
What it says. Disability is not only something that happens to a person. It is also something people share. A community, a history, a culture, and often a language of its own.
How it sounds. The clearest example is Deaf culture, written with a capital D on purpose. Many Deaf people do not consider themselves disabled at all. They are a linguistic and cultural minority with their own sign language, their own schools, their own theatre and their own jokes. Under the medical model that is a hearing loss to be corrected. Under this one it is an identity, and "correcting" it looks very different.
| What it gets right | What it gets wrong |
|---|---|
| Belonging is protective. Pride and community are good for people, and isolation is not. | The boundaries are unclear. Who is in, and who decides, is genuinely contested. |
| It is where political power comes from. Nothing in this field was granted, it was organised for. | "Nothing about us without us" is a demand this model makes, and it exposes how rarely organisations meet it. |
| It reframes disabled people as experts on their own lives rather than cases to be managed. | A single disability identity can flatten enormous differences between very different experiences. |
9. The charity model
What it says. Disabled people are unfortunate, and deserve pity and help from those more fortunate. Sometimes called the tragedy model, which tells you most of what you need to know.
How it sounds. The telethon. The word "brave" applied to somebody doing the shopping. "We look after our special friends." Photographs of sad children used to raise money from people who will never meet them.
| What it gets right | What it gets wrong |
|---|---|
| It moves people, and historically it funded services when nothing else did. | It makes help a gift rather than a right, and a gift can always be withdrawn. |
| Some of the institutions it built are still doing real work today. | It assumes incapacity, and treats an adult as somebody to be looked after rather than consulted. |
| It builds attitudinal barriers, which are harder to remove than steps. |
Watch for it in your own communications. This is the model most likely to sneak into a campaign nobody meant to be patronising. If your copy would make the person in the photograph wince, that is this model showing through. Inspiration and pity are the two tells.
10. The wider family
Those seven are the professional standard, and they are not the whole literature. Disability studies has named something like two dozen models over the years. You do not need to memorise the list. You do need to recognise the ones you will actually meet, because several of them are far more common in ordinary conversation than any of the seven above.
The useful way to hold them is by what each one does to people, which sorts them into three groups.
11. Models that hold people back
These are the ones sensitisation work exists to shift. Nobody announces them. They come out sideways, in a sentence somebody did not think twice about.
The moral and religious model
What it says. Disability is a punishment, a curse, a test, or the consequence of something somebody did. The kinder version says a disabled child is a special soul, sent to teach the family patience.
How it sounds. "What did they do to deserve this?" "It is a test." "The family must have done something." And the gentle version, "God gives these children to strong parents."
Why it matters more than any other model on this page. This is the one that keeps a child at home rather than at school, and it is the one people almost never say out loud in a training room. The barrier here is shame, not steps, and shame does not get fixed by a ramp. Notice that the kind version does harm too. It makes the person a lesson for somebody else, and it turns access into a matter of accepting your lot rather than fixing a building.
Handle this one with care. Section 14 covers how, because doing it badly loses the room permanently. The short version is that you are not there to argue with anybody's faith. "This is a test from God" and "the building should have a ramp" are not in conflict, and pretending they are is the fastest way to end a useful conversation.
The tragedy model
What it says. Disability is the worst thing that could happen to a person. A life diminished, and a story with a sad ending.
How it sounds. "I would rather die than end up like that." "Such a waste." And, wearing a smile, "if he can do it with his condition, what is your excuse?"
Why it matters. That last one is the reason to name this model separately from charity. Inspiration works exactly like pity, because both of them treat an ordinary disabled life as remarkable. A disabled person getting to work is not a story. It is Tuesday.
The sick role model
What it says. Society will excuse you from normal duties, and in return you are expected to want to get better and to cooperate with treatment. It comes from the sociologist Talcott Parsons.
How it sounds. "She has given up." "He is not really trying." "You seem to have just accepted it."
Why it matters. It is a deal that permanent conditions cannot keep. A disabled person who is content with their life reads, under this model, as somebody who has failed to hold up their end. That is where a surprising amount of everyday hostility comes from.
The expert, or professional, model
What it says. The medical model with a hierarchy attached. A trained professional identifies the need and prescribes the answer, and the disabled person receives it.
How it sounds. "We will assess her and decide what she needs." Notice who is not in that sentence.
Why it matters. It builds services nobody asked for, and it is the precise reason the phrase "nothing about us without us" had to be invented.
The rehabilitation model
What it says. Disability is a deficiency to be reduced through therapy and training, so that the person can fit the world as it currently is.
How it sounds. "Once she finishes the programme she will be able to manage."
Why it matters. Rehabilitation is genuinely valuable and it becomes a barrier the moment it is the price of admission. Compare it with functional solutions, which is nearby but not the same. Rehabilitation changes the person. Functional solutions changes the task.
The legitimacy model
What it says. The gatekeeping question. Who really counts as disabled, and who is putting it on.
How it sounds. "But he can walk a little." "She does not look disabled." "Is that a real disability?"
Why it matters. It falls hardest on the conditions you cannot see or that come and go. Chronic pain, fatigue, mental health, neurodivergence. It is also the model behind somebody being challenged for using an accessible parking bay.
The biomedical model
What it says. The narrowest form of the medical model. Health is biology, and nothing else is considered relevant.
How it sounds. A file containing a diagnosis and nothing at all about the person's life.
Why it matters. It remains the default of a great deal of clinical training, and it is where language like "wheelchair bound" comes from.
12. Models that push things forward
These are the ones worth borrowing from. Several are close relatives of the social model and each brings something it does not have on its own.
The human rights model
What it says. Access is owed because a person is a person. Not because it is affordable, not because there are enough of them, and not because they are inspiring. This is the model of the CRPD.
How it sounds. "This is a right, not a favour."
Why it matters. It is the strongest ground to argue from, because it does not depend on a headcount. Worth being clear how it differs from the social model, since the two get used interchangeably. The social model tells you where the problem is. The rights model tells you who is obliged to fix it.
The affirmation model
What it says. A non-tragic view of disability. A valid way of being, with its own culture, humour and pride. It was put forward by Swain and French as a direct answer to the tragedy model.
How it sounds. "I am not myself despite my disability. I am myself, including it."
Why it matters. This is the tone your communications should be aiming at. If a photograph would make the person in it wince, you have drifted back to tragedy.
The minority model
What it says. Disabled people are a minority group facing discrimination, in the same shape as any other civil rights struggle.
How it sounds. "This is discrimination, and there is a law about it."
Why it matters. It borrows a language the room already understands, which makes it unusually effective with people who have never thought about disability but have thought about fairness.
The identity model
What it says. A close cousin of the social identity and affirmation models. Disability as a positive identity claimed by the person, rather than a label handed to them by a clinician.
How it sounds. "I am disabled," said plainly and without apology.
Why it matters. It is the reason many people prefer identity first language, and the reason "differently abled" and "special needs" tend to land badly. Ask, do not guess.
The empowering, or customer, model
What it says. The disabled person directs their own support. They decide what they need and who provides it, and the professional advises rather than decides.
How it sounds. "What would help?" asked before anything has been decided.
Why it matters. Personal budgets and self directed support come from here. Its test is very simple and very revealing. Who signs off?
The market model
What it says. Disabled people, plus their families and friends, are an extremely large group of customers and voters. Over a billion people worldwide before you count anybody who cares about them.
How it sounds. "This is a serious market and we are not serving it."
Why it matters. It is the economic model in a more useful tone, and it carries the same warning. Useful for opening a budget, dangerous as the reason.
The diversity model
What it says. Disability is ordinary human variation, like height or first language. The interesting question becomes how well a system copes with variation.
How it sounds. "People vary. Our systems should expect that."
Why it matters. It removes the sense that access is a special case for a special group, which is exactly the assumption universal design is built on.
The relational model
What it says. Sometimes called the Nordic model. Disability is a mismatch between a person and an environment, so it appears and disappears depending on where you are.
How it sounds. "He is disabled in this building and not in that one."
Why it matters. It explains situational limitation cleanly, and it is the model closest to how designers already think, which makes it easy to teach to a design team.
The spectrum model
What it says. Ability is a range rather than two boxes. Everybody sits somewhere on it, and everybody moves along it during their life.
How it sounds. "Everyone is somewhere on this range, and nobody stays still."
Why it matters. It is the fastest way to get a sceptical room to see themselves in the work, which is why part 1 leads with it.
The social adapted model
What it says. The impairment is real and it does limit you, and society's barriers are still usually the larger part of the problem.
How it sounds. "Yes, her condition limits her. The building limits her more."
Why it matters. It is a practical middle ground for people who find the pure social model too absolute, and it wins arguments that the pure version loses.
13. So which one should you use?
The exam answer is that the social model and the biopsychosocial model align most closely with accessibility and universal design. That is true, and it is worth knowing why rather than just remembering it.
The working answer is that these are tools rather than beliefs, and a professional keeps several in the bag.
Stand on the human rights model
Everything else is tactics. This is the ground. Access is owed because a person is a person, and that does not depend on how many of them there are.
Frame with the social model
It is the one that names something you can build. Start every conversation here, because it puts the work where the work actually is.
Stay honest with the biopsychosocial
When somebody says removing the barrier is not the whole story, they are usually right, and this is the model that lets you agree without giving up the point.
Ship with functional solutions
While the ramp is being built, the portable one is not nothing. Just do not let the temporary fix become the permanent answer.
Fund with the economic argument
Second, never first. It opens budgets and it should never be the reason you gave somebody their rights.
Lead with social identity
Ask disabled people what to build, and pay them for the expertise. This model is the reason "nothing about us without us" is a rule and not a slogan.
Use the medical model only where it belongs
Deciding eligibility, yes. Deciding what to build, no. And retire the charity model from your language entirely.
14. Using these in sensitisation training
This is where models earn their keep. A sensitisation session is not really about facts, because most people already know that ramps exist. It is about the belief sitting underneath what somebody says, and the models are the names for those beliefs. Give a room the vocabulary and they start hearing themselves.
Sessions tend to fail in one of two ways. They preach, or they simulate. Here is a shape that avoids both.
Start with sentences, not theory
Ask the room for real things they have heard said about disabled people. Write them up without comment. Do not name a single model yet. You will get the moral model inside two minutes, and it will have come from them rather than from you.
Sort them, do not score them
Put up the three columns: holds people back, sits in the middle, pushes forward. Ask the room to place each sentence. Arguments here are the actual learning. Your job is to keep asking "so what would that person go and do about it?"
Name the models last
Only now put names to the columns. By this point the room has already worked out the idea, so the vocabulary lands on something they built rather than something they were told.
Run one situation through all of them
Use a local example, not a textbook one. The bank with three steps works because everybody has seen that bank. Section 2 is the pattern.
Practise the swap out loud
Give people the language table below and make them actually say the sentences. Reading them silently changes nothing. Saying "the entrance has a step" three times is what makes it available under pressure.
Close with one commitment each
One thing each person will do differently, said aloud, this week. Not a policy. Something small enough that not doing it would be embarrassing.
The language swap
Every phrase on the left carries a model with it. The point is not politeness, it is that the right hand column names something somebody can act on.
| Retire this | Say this | Because it is |
|---|---|---|
| Wheelchair bound, confined to a wheelchair | Uses a wheelchair, wheelchair user | Biomedical |
| Suffers from, afflicted with, a victim of | Has, lives with | Tragedy |
| The disabled, the blind, the deaf | Disabled people, blind people, Deaf people | Charity |
| Special needs, differently abled | Disabled, or the specific access need | Charity, and usually unwelcome |
| Normal people, able bodied people | Non-disabled people | Legitimacy |
| So inspiring, so brave | Nothing. It was an ordinary day. | Tragedy |
| We look after them | We work with them, they decide | Expert, charity |
| Wheelchair users cannot enter | The entrance has a 180mm step and no ramp | Medical, and it names nothing to fix |
| We cannot afford it for so few people | What would it cost, and what is it costing us now? | Economic |
| They are welcome to ask for help | They should not need to ask | Charity |
Four things not to do
These are the mistakes that make a session actively worse than not running one.
- Do not run a disability simulation. Blindfolds, an hour in a wheelchair, ear plugs. It feels powerful and it teaches the wrong lesson. What a blindfold actually simulates is a sighted person suddenly losing their sight, with no training, no cane skills and no adaptation. That is frightening, so the room comes out with pity and relief rather than an understanding of barriers. A blind person is not a sighted person with their eyes shut. If you want people to feel a barrier, send them to measure a real entrance with a tape, or to use a real website with the mouse unplugged. Both teach the barrier rather than the impairment.
- Do not let the room feel accused. Everybody in it has used the charity model, including you. The models are in the water we all grew up in. A session that feels like a trial produces silence and agreement, and changes nothing on Monday.
- Do not run it without disabled people, and pay them. A session about disabled people delivered entirely by non-disabled people is the expert model performing itself in front of the room. If you cannot arrange it, say so out loud and name it as a limitation rather than hoping nobody notices.
- Do not end on feelings. A room that leaves moved and without a task has had an experience, not training. The last ten minutes decide whether any of it survives contact with the working week.
Talking about the religious model, carefully
In a religious society this is the deepest layer, and it is the one that decides whether a child goes to school. It is also the one where a clumsy facilitator loses the room and does not get it back. A few things that help.
- You are not there to argue with anybody's faith, and if the session turns into that, you have lost regardless of who is right.
- The two ideas are not in conflict. "This is a test from God" and "the building should have a ramp" can both be true. Someone can hold their belief entirely intact and still agree that the entrance needs fixing. Say that plainly and early, because people brace for an attack that is not coming.
- Ask the question that actually matters. Not whether the belief is correct, but this: does the belief require anybody to stay at home? It does not. Every major tradition teaches dignity, and against mocking people, and for justice and care. Those teachings are on your side.
- Name the harm rather than the belief. A child kept out of school is the harm. Whether the family got there through a religious idea or a medical one, the fix is the same and the conversation stays practical.
- Watch for the kind version. "A special soul sent to teach us patience" is warmly meant, and it still makes the person a lesson for somebody else instead of a person with somewhere to be. That is a gentler conversation and it is still worth having.
15. Spot the model
This is the skill that actually transfers. Read the sentence, name the lens. Once you can do it quickly, you will start hearing it in meetings, and you will know which argument will land.
16. Recap
- A model answers one question: where is the problem? The answer decides the work.
- Medical puts it in the body. Useful for eligibility, useless for deciding what to build.
- Social puts it in the environment. This is the foundation of accessibility practice.
- Biopsychosocial holds body, mind and environment together. It is the basis of the WHO's ICF.
- Economic measures the cost. Good for budgets, dangerous as a justification.
- Functional solutions fixes the task in front of you. Practical, and it leaves the cause standing.
- Social identity treats disability as community and culture. Where expertise and political power come from.
- Charity treats it as misfortune. Retire it from your language.
- Beyond those seven, the ones you will actually meet are the moral and religious model, which keeps people at home, the tragedy model, which also wears a smile as inspiration, and the human rights model, which is the strongest ground to stand on because it does not depend on a headcount.
- In a sensitisation session, start with sentences and name the models last. And do not run simulations.
These seven come from the IAAP body of knowledge for the CPACC certification. If you are working towards it, the study material for this domain is listed on the resources page. If you are simply doing the work, carry on to part 2 on the standards, which is where these ideas turn into things you can be held to.