1. Think "people first." Say "a woman who has mental retardation" rather than "a mentally retarded woman."
2. Avoid words like "unfortunate," "afflicted" and "victim." Also, try to avoid casting a person with a disability as a superhuman model of courage. People with disabilities are just people, not tragic figures or demigods.
3. A developmental disability is not a disease. Do not mention "symptom," "patients" or "treatment," unless the person you're writing about has an illness as well as a disability.
4. Use common sense. Avoid terms with obvious negative or judgmental connotations, such as "crippled," "deaf and dumb," "lame" and "defective." If you aren't sure how to refer to a person's condition, ask. And, if the disability is not relevant to your story or conversation, why mention it at all?
5. Never refer to a person as "confined to a wheelchair." Wheelchairs enable people to escape confinement. A person with a mobility impairment "uses" a wheelchair.
6. Try to describe people without disabilities as "typical" rather than "normal."