Discussion of the self model will entail consideration of the role of the Self as a symbolic interactionist construct. They are parsimonious. They are incomplete. They lack firm boundaries. They can be used in prediction and explanation.
Mental models are parsimonious because they are simpler than the object or process they represent.
Johnson-Laird, P. N. and Byrne , R. M. J., Deduction, Erlbaum, Hove, 1991. It is important to remember that this is a competence model for syllogistic reasoning. Lawrence Erlbaum Associates. The new theory applies to a class of arguments that seem not yet to have been examined within the mental models framework. Although EST is not a formal corollary of MMT, it preserves some important features of the latter.