The Graham-Denning model is a way of looking at how logic works in computers. Basically, logic is the process of taking a set of information and using it to work out what will happen in a certain situation. Computers use logic to do things like remember numbers, do mathematical calculations, or control a robot.
In the Graham-Denning model, logic is broken down into four simple steps. First, the computer takes in some information (this could be numbers, words, or commands). Second, the computer uses that information to make decisions. Third, the computer follows the decisions it has made, and fourth, it gives you a result.
So, using the Graham-Denning model, a computer can understand data, make decisions, and then give you a result. This helps computers “think” and do tasks much faster than a human could.