Abstract: Embodiments in accordance with the present invention relate to a platform facilitating different drug development software programs. In one embodiment, the integrated software platform includes a graphical environment for creating, storing, and manipulating workflows. The workflows depict operations that are to be performed by certain functional objects, and the flow of information between those objects. One example of an object is a model of drug behavior, disposition, and/or physiological response to drug activity, and certain embodiments allow for the graphical creation and editing of such a model. Other embodiments provide a user with the ability to easily overlay model predicted valves with observed data.