Ventity from Ventana systems tells us how to go from Stock and Flow diagram (SFD) to Entity Relationship (ER) diagram. How to do the reverse? i.e. how to start with ER model and reach SFD. I think that is the natural way of progressing as domain knowledge is often given in the form of ER models.
Going from ER diagram to system dynamics modeling requires an interactive approach. It does not appear to be an one time approach wherein one can convert and ER model into an SD model. The basic reason being that all entities are not level variables and which entity is a level variable depends on the context. Consider this statement: Student take courses in the university and stay in hostels. In this sentence 'student', 'university' and 'course' all are entities, but which of them is/are level variables depends upon where accumulation occurs. Student is the most likely candidate for being a level variable as students "flow in" and flow out of the university after completing the courses. Courses and hostels remain relatively stable though new courses are added once in while and some courses are dropped also. Hostels are also not added regularly. Hence these entities do not participate in the dynamics and hence can not be taken as level variables.
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