1. A computer-implemented method for determining a comprehensibility score of an executable graphical model generated in a graphical modeling environment, the method comprising: analyzing, using a computer, the executable graphical model to identify one or more visual characteristics of one or more elements in the executable graphical model; determining, using the computer, the comprehensibility score of the executable graphical model based on the analyzing, the determining comprising: representing an ergonomic complexity of the executable graphical model using the comprehensibility score, where: the comprehensibility score is a function of the identified one or more visual characteristics of the one or more elements in the executable graphical model, the one or more elements represent: one or more entities in the executable graphical model, or one or more relationships in the executable graphical model, the comprehensibility score is based on a syntactic complexity of the executable graphical model, and the syntactic complexity includes: a visual complexity created by a presence of the one or more entities in the executable graphical model, and a modeling complexity created by a functionality or a data structure of the one or more entities in the executable graphical model; and displaying, using the computer, the comprehensibility score of the executable graphical model.