Representations are different ways of looking at the model. Let's say you have a book. The ideas are the model and they can be adapted into various representat

Representations are different ways of looking at the model. Let's say you have a book. The ideas are the model and they can be adapted into various representations such as the book, a magazine excerpt, a movie, a musical, etc. I think he means that the people who have trouble with design are those who focus on solving the problem that the representation demonstrates rather than solving the underlying problem (which is in the form of the model). So the solutions are specific and brittle rather than general and adaptable. Or something like that...