Models of Disability
How seven different ways of defining disability change what a designer, an employer and a government each decide to do about it. Lesson 1 of the A11ytek CPACC course, free to read.
What this covers, and why the exam cares
A model of disability is a lens. It carries a set of assumptions about what disability is, what causes it, and whose job it therefore becomes to do something about it. Change the lens and every practical question that follows gets a different answer: who gets funded, what gets built, who is consulted, who decides.
The content outline does not ask you to list the models. It asks you to characterise and differentiate between them, including the strengths and weaknesses of their underlying assumptions. That phrasing tells you what the questions look like. They rarely say "which model is this". They describe a situation, a policy, a product decision, a funding rule, a sentence of marketing copy, and ask which assumptions are operating underneath it.
So the skill here is recognising a model by how it behaves when nobody names it.
Domain I carries 40% of the exam, more than any other. This lesson sits under all of it.
One question everything rests on
Almost all the disagreement between these seven models reduces to a single question.
Where is the problem?
Put it in the person and the answer becomes treatment, therapy, or a device. Put it in the environment and the answer becomes changing the building, the policy, the website. Put it in the interaction and the answer depends on both.
Work out where a model locates the problem and you can usually reason out its strengths and weaknesses without having memorised them.
One warning before we start, because it is a common misreading. These are not stages in a story of progress from bad old thinking to good modern thinking. All seven are alive right now, often inside the same organisation on the same afternoon. A hospital can treat on the medical model, fundraise on the charity model, and comply with law written on the social model, and nobody in the building will notice the contradiction.
1. The Medical Model
Disability, on this account, is a condition inside a person's body or mind. Disease, injury, or a difference from the typical causes it. It is a problem the person has, and the sensible response is to diagnose, treat, cure, or manage it.
You can spot it in the language and in the paperwork. Someone is described as "suffering from" a condition. A form demands a diagnosis before it will discuss adjustments. A child is placed in a special programme on the strength of a clinical assessment. An employer wants a doctor's letter before agreeing to a change that nobody would need a letter to justify.
It gets a great deal right, and this is worth saying plainly, because the model is often dismissed too quickly. It is why treatments exist, why pain gets managed, why conditions get researched at all. Some people actively want treatment and find it insulting to be told their condition is purely a social construct. On its own terms, medicine has done enormous good.
Its weakness is that it puts the whole problem inside the person, which quietly implies that nothing outside them needs to change. It makes the professional the expert and the disabled person the subject: the one things are decided about. And it has no answer at all for a condition with no cure. If the goal is to fix the person, then a person who cannot be fixed becomes a failure of the system, rather than someone the system failed.
That last point is where the exam tends to probe.
2. The Social Model
Here the condition is not the disability. Disability is what happens when a society is built as though the condition did not exist.
The model splits two words that ordinary speech runs together. Impairment is the condition itself: not being able to see, not being able to walk. Disability is the disadvantage imposed by a world designed without you in mind.
On this view a wheelchair user is not disabled by their legs. They are disabled by the step. Remove the step and the impairment is unchanged, but the disability has gone.
It came out of disabled activism in Britain in the 1970s, most directly from the Union of the Physically Impaired Against Segregation, whose 1976 statement drew that impairment and disability distinction. Mike Oliver gave it the name "social model" in the early 1980s.
Its strength is that it moved responsibility from the individual to the society, and in doing so made accessibility law, universal design and the whole of this profession possible. It is politically powerful because it casts disabled people as people denied something rather than people who need something. Nearly every accessibility standard in the world is built on it, this one included.
The criticism worth knowing comes from inside the disability community, not outside it. Pushed to its limit, the model can imply that impairment itself costs nothing, that a perfect environment would leave no difficulty behind. For someone in chronic pain, or with a degenerative or fatigue condition, that is untrue, and can feel like being told their experience is imaginary. It is the right foundation for designing a website. It is an incomplete account of a life.
3. The Biopsychosocial Model
This one argues that the medical and social models are each describing part of something larger. Disability emerges from the interaction between a health condition, personal factors such as age, education, resources and outlook, and environmental factors such as buildings, attitudes, policy and technology.
It underpins the World Health Organization's International Classification of Functioning, Disability and Health, the ICF, adopted in 2001. A great deal of international disability data is collected against that framework.
Of the seven it is the most complete. It refuses the false choice between the body and the barriers, and says, correctly, that identical impairments produce wildly different amounts of disability depending on where you live, what you earn and who is around you.
Completeness is also its problem. A model that says everything matters gives less direction than one that says remove the step. It is harder to campaign with and harder to write law from. In practice, assessment systems have sometimes used it to shift attention back onto the individual's "personal factors", their attitude and their motivation, which is the medical model in a better coat.
4. The Economic Model
Disability here is defined by its economic effect: what a person can do as a worker, what they produce, what they cost an employer, an insurer, or a state.
It runs the eligibility rules for disability benefits. It is why workers' compensation assessments express a human being as a percentage of lost earning capacity. It sits under insurance underwriting. And it is the business case you have very likely made yourself, the one about an accessible site reaching more customers.
Give it credit for this: it is the model that actually moves money. Income support, vocational rehabilitation, funded workplace accommodations and return-to-work programmes all live inside it. In a commercial meeting it is frequently the only argument that lands, which is why accessibility professionals reach for it constantly, whatever they believe privately.
The cost is that it measures a person by their output. On its own terms someone who cannot work has no value to account for, which takes in children, retired people, and anyone the labour market has no use for. It also builds gatekeeping into the system. To receive support you must prove incapacity, which means proving how little you can do, repeatedly, to someone with the power to disbelieve you.
Worth remembering for the exam, and for your working life. The business case is an economic-model argument. If a scenario describes an organisation justifying accessibility purely by market reach or reduced legal risk, that is this model, even though the outcome is one you would applaud.
5. The Functional Solutions Model
A practical, engineering view. Disability is a set of functional limitations; the job is to identify each one and build something that gets round it. Largely uninterested in the philosophical argument.
This is the model behind assistive technology: screen readers, switch access, prosthetics, voice control, adapted vehicles, the whole device industry. Closer to home, it is also the model behind an accessibility audit that produces a list of defects and a list of fixes.
Things get built. That is its case, and it is a strong one. It has driven genuine invention, some of which, as usual, ended up being used by everybody.
What it misses is that treating a person as a collection of deficits to engineer around can stop you asking why the deficit exists. A stair-climbing wheelchair is an impressive solution to a building that should have had a ramp, and buying one lets the building off. Devices are also expensive, frequently abandoned, and sometimes simply not what the person wanted, having been designed for them rather than with them.
Take care not to confuse this with the medical model. Both put the problem in the individual. They differ on what happens next: medicine wants to treat or cure the person, functional solutions accepts the impairment as given and engineers around it.
6. The Social Identity or Cultural Affiliation Model
Disability as identity and culture. Something a person belongs to, shares a language and a history with, and takes pride in, rather than a deficit to be fixed or accommodated.
Deaf culture is the clearest illustration. Many Deaf people, and the capital D is deliberate and is itself part of the argument, understand themselves as members of a linguistic and cultural minority with its own language, literature, humour, schools and history. Read that way, curing deafness is not self-evidently a kindness. It is the end of a culture.
This is the only one of the seven that treats disabled people as the authority on their own lives. It replaces pity and deficit with belonging, and the communities built on it produce mutual support, political strength and a good deal of joy.
It does not fit everyone. Someone with a recently acquired impairment, or a hidden one, or one they experience as purely burdensome, may want no part of an identity. Identity claims can also turn inward; the long and painful argument within Deaf communities over cochlear implants is the standard example. And being assumed into a community you never joined is its own way of not being seen.
7. The Charity Model
Disabled people as unfortunate, suffering, dependent on the goodwill of others. The right response, on this view, is compassion, donation, care.
You know it when you see it. Fundraising built on sad music and a child in a wheelchair. Telethons. The word "inspirational" attached to somebody doing their shopping. "Confined to a wheelchair." "Victim of." "Brave."
In fairness, it raised money, and for long stretches of history nothing else did. Many services, schools and hospitals exist because somebody gave out of pity, and dismissing the model entirely rewrites that history.
Almost everything else about it is a problem. It makes disabled people recipients rather than citizens with rights. All the power sits with the giver, who can stop giving whenever they choose; a right cannot be withdrawn, a donation can. It sets expectations low, because a person you pity is not a person you hire. Disability rights movements have fought this model harder than any other, including by protesting the very telethons raising money in their name.
This is the one the exam is most likely to test through language. If a question quotes wording that frames a disabled person as an object of sympathy, you have your answer.
The distinction candidates get wrong
Medical, functional solutions and economic are the three that get mixed up, because all three put the problem in the individual. What separates them is what each wants to do next.
| Model | Where is the problem? | What should be done | Who holds the power |
|---|---|---|---|
| Medical | In the person's body or mind | Diagnose, treat, cure, manage | The clinician |
| Functional Solutions | In what the person cannot do | Build a device or a workaround | The engineer or designer |
| Economic | In the person's capacity to work | Assess, compensate, fund a return to work | The insurer, employer or state |
| Social | In the environment | Remove the barrier | Society, and the law |
| Biopsychosocial | In the interaction of all of it | Address body and barriers together | Shared, in principle |
| Social Identity | Nowhere. It is not a problem | Recognise the culture | The disabled community |
| Charity | In the person's misfortune | Give, help, care for | The giver |
When you are stuck, read the last column. Who is assumed to be in charge is usually the fastest way to name a model, and it is the question the seven genuinely differ on.
There is a second trap. More than one model is normally running at once, and exam scenarios are written that way deliberately. A hospital that treats a patient, bills their insurer, fits them with a device and features them in its annual appeal has used four. When a question hands you a scenario, look for the model behind the specific decision described, not behind the organisation as a whole.
Check yourself before the questions
Cover the table and answer these in your own words.
- A council installs a stairlift in a building where a ramp would have fitted. Which model is at work, and what is the criticism of it?
- Why does the social model make a government's accessibility law possible in a way the medical model does not?
- Give one fair criticism of the social model, of the kind a disabled person might make.
- An employer agrees to an adjustment only after calculating the cost of a tribunal. Which model is that, and does the motive change the answer?
- Why might a Deaf person object to a cure being described as good news?
Answer 3 and 5 without hesitating and you have understood this lesson. Those two are where the exam separates people who memorised a list from people who followed the argument.
Primary sources
Read at least the first two. Everything above is a summary, and a summary is always somebody else's judgement about what mattered.
- Union of the Physically Impaired Against Segregation, Fundamental Principles of Disability (1976). The document that split impairment from disability.
- World Health Organization, International Classification of Functioning, Disability and Health (ICF) (2001). The biopsychosocial framework in its official form.
- United Nations, Convention on the Rights of Persons with Disabilities (2006). Read the Preamble and Article 1. You will meet it again in Lesson 14, and you can work out for yourself which model it is written from.
- Mike Oliver, The Politics of Disablement (1990). The social model argued at length by the person who named it.
The rest of the course
This is the first of 17 written lessons, which sit alongside three domain checkpoints. The full CPACC course is included with an A11ytek Exam Prep CPACC subscription, alongside the 5,021 verified CPACC practice questions, spaced repetition and mock exams.
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