Explain the most appropriate methods to use in designing a product for the user in the following scenario, including aspects of the user interface that might need special attention. Situation: A researcher approaches a designer with a request for a computer interface that will allow the evaluation of the ways children process spatial relationships and the various changes as they learn and develop. The computer interface will not have to perform any task but to play visual spatial games, recording and analyzing all elements in how children between the ages of 2 and 5 manipulate visual objects on a screen.