This course introduces rigorous and formal methods for modelling system behaviour. These methods support the modelling of abstract specifications and the refinement of abstract specifications through to concrete implementations. Consistency of formal development is verified by proof obligations and formal proof. The course will cover: specification, refinement, implementation, proof obligations and proof. It builds on prerequisite knowledge from MATH1081, especially set theory and predicate logic. The course will use case-studies and assignments to develop competence. The methods developed in this course may be used in the SENG2010 and SENG2020 workshops.