A method for generating a software model of a dynamic system takes as input a preliminary software model of the system. Normally, the preliminary software model is based on a system model that is generated by a system designer within a modeling environment. Generally speaking, the preliminary software model does not allow access to the internal variables of the system model from outside the modeling environment, but nonetheless may be executed on a computer platform in the absence of the modeling environment. Interface software is then produced which exposes the internal variables of the system model. The resulting software model, built from both the preliminary software model and the interface software, allows programmatic access to its internal variables, and potentially allows execution control, from outside the modeling environment, thus typically enhancing detailed simulation of the system model beyond the capabilities provided by the modeling environment.