Most staff already adapt when they realize someone is having trouble. The problem is what they adapt. Useful changes are to format, pace and channel: shorter sentences, a slower rhythm, one question at a time, a written summary, a different way to reach you. Harmful changes are to tone: a higher pitch, pet names, exaggerated cheerfulness, talking to a companion instead, or a louder voice when the problem was never hearing. Researchers who study speech directed at older adults call this pattern elderspeak, and people on the receiving end describe the same thing whatever their age or disability: it feels like being demoted from adult to child in the middle of a conversation.
Plain language is the format change most people underuse. It is not dumbing down. Plain language puts the action first, uses one idea per sentence, chooses the familiar word over the official one, and says who does what by when. It makes a notice about an eligibility deadline more precise, not less. Write “Send us your pay stubs by the 15th so your benefits continue” instead of “Failure to submit requested verification documentation by the specified date may result in case closure.”
Checking understanding is where good intentions most often fail. “Do you understand?” gets a yes from almost everyone, because saying no is embarrassing. Ask instead what the person will do next, or how they will explain it to someone at home. If the answer is off, the gap is in your explanation, and you now know exactly where.
