Process modeling is an important task during many process engineering activities such as steady-state and dynamic process simulation, process synthesis or control system design and implementation. The demand for models of varying detail is expected to steadily increase in the future due to advances in model-based process engineering methodologies. Computer assistance to support the development and implementation of adequate and transparent models is indispensable to minimize the engineering effort. The state of the art and current trends in computer-aided modeling are presented in this contribution which is intended to serve as a survey and a tutorial at the same time.