If recipients don't understand or like what the author intended, they will infer the intent and the author. The author of a communication is also a vital component in the communication process as the model shows. I have my own knowledge base, my own purpose in communication, both of which will affect the message I send. So the writer must always strive to communicate with readers by giving them important information from the perspective in which the readers will view the system. Readers will understand almost any concept important to them if it is presented in a way that fits within their horizon of expectations.
Children learn to use a computer more quickly and easily than most adults for a reason.
One of the many things about small children that we ignore is that they have no matches in long-term memory. Everything is quite new, so they don't look for matches. Therefore they don't find the wrong matches and don't get frustrated at not finding any. They have no prior expectations to work around and through. Adults are loaded with prior expectations and none of them fit the computer.