Most parents handed a symbol board are told to model on it: touch the words yourself while you speak, so your child sees the board used before anyone expects them to use it. Almost nobody is told how much.
That gap matters, because modelling is one of the few things in AAC where the amount is the active ingredient. A few models a week teaches a child very little. The same technique, several times inside every routine, is the most consistent thing separating children who start using a board on their own from children who do not.
The ratio worth aiming for
The rough ratio most speech therapists teach is two models for every one time you expect a response. In the first few months, five to one is closer to right.
The important half of that ratio is the half with nothing attached to it. A turn where you tap a word and then wait for your child to tap it back is not a model. It is a question with a demonstration in front of it, and it belongs on the other side of the ledger. Models are the times you touch the board, say the word, and carry on with whatever you were doing.
What that looks like in an ordinary day
- Pouring juice. Tap more, say "more juice."
- Leaving the park. Tap all done, say "all done park."
- Something crashes in the next room. Tap uh oh, say "uh oh."
- Reading together. Tap look, say "look, a dog."
Notice what is missing. There is no question. No "can you say more?" No "show me where more is." You are narrating, not testing, and that difference is the whole thing.
Why the count matters more than the technique
No child learns to talk by being quizzed. They learn from hearing thousands of words used naturally by the people around them, long before anyone asks them to produce one. A child learning a symbol board needs exactly the same thing.
Most of them never get it, and usually not because the adults around them are doing the technique wrong. It is because those adults only touch the board when they want an answer out of it. The board turns into the thing that appears when something is being asked of you. Volume is what changes that, and volume only comes from the turns nobody is waiting on.
Count your own turns, not your child's
If you want to know whether you are anywhere near two to one, the number to watch is yours. Your child's responses are the wrong measure this early. They are slow and uneven by nature, and it is easy to read far too much into a quiet week.
It also feels strange for about a week. Talking to a board that does not answer is not a natural adult habit, and feeling self-conscious about it, particularly in front of other people, is normal. Then it stops feeling like anything at all, which is usually the point where the ratio starts looking after itself.
Try this
Pick one routine that happens every single day without fail. Snack, bath, the car. Model two words inside it, every time it happens, for seven days. That is the whole of it. Do not ask your child to copy you, and do not keep score of what they do.
Seven days is not long enough to change how a child communicates. It is long enough to find out what your real ratio is.