CPACC - Module 1: theoretical models of disability

The CPACC (Certified Professional in Accessibility Core Competencies) is IAAP’s foundational, cross-disciplinary credential. Its Body of Knowledge opens with Domain 1 — Disabilities, Challenges, and Assistive Technologies — and the very first module is the theoretical models of disability.

These models are simply ways of thinking about disability. How a society thinks about disability shapes its policies, its prejudices, and the solutions it builds. That is why the exam starts here: understand the frameworks and the rest of the body of knowledge has somewhere to attach.

The eight models at a glance #

| Model | Core idea | Exam watch-word | Example | |---|---|---|---| | Medical | Disability is a health problem in the individual, to be cured or managed | cure / management | Insulin pump, prosthetic leg | | Social | Society creates disability by building barriers — and must remove them | society removes barriers | Ramps & elevators, WCAG-compliant site | | Biopsychosocial | The interplay of biological, psychological, and social/environmental factors | comprehensive interplay | Low-distraction workspace for ADHD | | Human Rights | People with disabilities have inherent rights, protected by law and policy | international law / CRPD | UN CRPD | | Functional Solutions | Practical fixes for individuals via assistive tech & adaptive strategies | assistive technology | Screen reader, split keyboard | | Social Identity / Cultural Affiliation | Disability can be central to identity and a source of pride | pride / identity | Deaf (capital D) culture | | Economic | Disability defined by ability to work and effect on productivity | ability to work | Welfare payments, subminimum wage | | Charity | People with disabilities are unfortunate and need help | pity / telethons | Telethons, charity runs |

The eight models in detail #

1. Medical model #

Considers disability as a health problem that affects the individual, to be cured or managed. It does not address society’s role in creating barriers.

Strength: medical treatment is vital — often lifesaving.
Weakness: by focusing on treating the person, it ignores society’s role in creating and removing barriers.
Examples: a prosthetic leg lets someone walk and run; an insulin pump helps regulate blood sugar.

Concerned with equal access. It views society as responsible for creating disability — because society builds the barriers — and therefore responsible for removing them. The barriers are not inevitable.

Strengths: affirms the right to participate in society; makes clear that barriers are a choice, not a fact of nature.
Weakness: can downplay the biological and medical realities of disability.
Examples: a wheelchair user reaches every floor because of ramps and elevators; a dyslexic student uses an audiobook; a screen-reader user navigates a site built to WCAG.

3. Biopsychosocial model #

Accounts for the physical, psychological, and social contexts a person lives in. It centres the individual’s unique needs while also addressing systemic barriers and the interplay between disability, experience, and environment. (This is the perspective behind the WHO’s ICF.)

Strengths: promotes wellbeing across systems; values social and environmental support.
Weakness: more complex than the medical or social models — it can blur which factor is causing which part of someone’s experience.
Examples: an ADHD employee thrives in a low-distraction office; a Zoom host lets people choose whether to be on camera; clear hospital wayfinding helps a stressed patient find their appointment.

4. Human rights model #

Expands the social model. It recognizes that people with disabilities have inherent, fundamental human rights that must be protected through legal and policy frameworks, with governments responsible for promoting and protecting them.

Strengths: grounded in international human rights law; promotes active participation of people with disabilities.
Weaknesses: gives little practical direction on how to remove barriers; can overlook the lived experience of disability.
Example: the UN Convention on the Rights of Persons with Disabilities (CRPD).

5. Functional solutions model #

Focuses on practical solutions for individuals — overcoming functional limitations with assistive technology or adaptive strategies. It treats disability as a practical problem to be solved.

Strength: delivers concrete, practical help to individuals.
Weakness: its individual focus limits it for tackling systemic or social issues.
Examples: a blind person uses a screen reader; carpal tunnel is eased by a split keyboard; a spinal-cord injury is met with a wheelchair.

Recognizes that disability can be fundamental to a person’s identity.

Strengths: disability is accepted and can be a source of pride — highly affirming; groups can wield political power and drive change.
Weaknesses: people who don’t fit the group’s expectations can be alienated; the group can also separate members from wider society.
Example: the Deaf community (capital D) — a culture with its own language and customs.

7. Economic model #

Defines disability by a person’s ability or inability to work and how much an impairment affects productivity. It weighs financial consequences for the individual, the employer, and the state.

Strength: recognizes that disability can affect earning capacity and that people may need financial support and/or accommodations.
Weakness: if someone doesn’t meet the legal threshold for disability — or their status is disputed — they may not get the support they need.
Examples: a worker with a cognitive disability is paid below minimum wage; a family receives welfare because a parent stays home to provide care.

8. Charity model #

Regards people with disabilities as unfortunate and in need of help, and those who give as benevolent contributors to a needy population.

Strengths: can inspire people to give time and resources; sometimes the only funding source for, say, very rare diseases.
Weaknesses: people with disabilities often find it offensive and condescending — it frames them as objects of pity; tends to fund short-term needs over lasting solutions.
Examples: telethons; 5K charity runs.

Commonly confused pairs #

Which models align with accessibility? #

For accessibility and universal design work, the social, functional solutions, biopsychosocial, and human rights models are the ones that pull in the right direction — they locate at least part of the problem in the environment and push toward access, practical solutions, and rights. The medical, economic, and especially the charity models are more limited (or, in charity’s case, often actively resented by the community).

Quick self-check #

Match each scenario to a model, then check your answers.

Quick self-check

1. A person who is Deaf (capital D) sees themselves as gaining from deafness rather than impaired by it. Which model?

2. A perspective that recognizes the complex interplay of biology, psychology, and social/environmental factors. Which model?

3. A model that focuses on a person's ability to work. Which model?

4. A model that says it is society's responsibility to remove barriers. Which model?

5. A model that may inspire donations but can be condescending, portraying people as objects of pity. Which model?

6. Screen readers and voice dictation are functional solutions.

True False

7. A strength of the medical model is that it…

Provides cures or medical management of disabilities Removes the barriers society builds Treats disability as a source of identity and pride Grounds disability rights in international law

Study order that worked for me: learn the one-line core idea and watch-word for all eight first (the table), then drill the commonly-confused pairs, then test yourself on scenarios. The exam rewards fast recognition, not essays.