We live in a "model-centric" engineering world where modelling is regarded as a basic tool for decision making across the whole product and process life cycle. This underscores the importance of this unit since models or the outputs of models are often essential for high level decision making. This covers financial, engineering, risk, human factors and related modelling application areas. Students will gain an understanding of the types of models that exist, their construction and documentation, and finally how they are used to support process life cycle activities.