Specifically, in his own words:2 1. A map may have a structure similar or dissimilar to the structure of the territory. The London underground map is super useful to travelers. The train drivers don’t use it at all! Maps describe a territory in a useful way, but with a specific purpose. They cannot be everything to everyone. 2. Two similar structur

mental model includes constraints (things that can’t be done) and conventions (an understanding of and agreement