[2] Its usefulness, according to Mendling et al. (2006), was confirmed in a 2002 experiment by Moody et al.[3] The basic idea behind the SEQUAL framework is, that "conceptual models can be considered as sets of statements in a language, and therefore can be evaluated in semiotic/linguistic terms".
[5] in the 2002 article "Quality of interactive models"[6] Krogstie & Jørgensen extended the initial framework adding more levels of Stamper's semiotic ladder.
Similarly, for models on paper, the amount and security of backup copies will be essential.
Main aspects are: Basically empirical quality is about the question "Is the model easily readable?".
Empirical quality deals with the variety of elements distinguished, error frequencies when being written or read, coding (shapes of boxes) and ergonomics for Computer-Human Interaction for documentation and modeling-tools.
Ergonomics is the study of workplace design and the physical and psychological impact it has on workers.
There are different factors that have an important impact on visual emphasis like size, solidity, foreground/background differences, colour (red attracts the eye more than other colours), change (blinking or moving symbols attract attention), position and so on.
For graph aesthetics there may be different consideration(Battista, 1994, Tamassia, 1988) like angles between edges not be too small, minimize the number of bends along edges, minimize the number of crossings between edges, place nodes with high degree in the centre of the drawing, have symmetry of sons in hierarchies, have uniform density of nodes in the drawing, have verticality of hierarchical structures and so on.
For the three agreement parts (knowledge, interpretation and model) we can define: Degree of internalization of existing organizational reality.
The framework "include the six principles of correctness, clarity, relevance, comparability, economic efficiency, and systematic design".