This doctoral-level methods course introduces students to the design, evaluation, and implementation of complex health interventions using the Medical Research Council (MRC) Framework for Developing and Evaluating Complex Interventions. The course is designed to teach doctoral students how to move systematically from intervention concept → development → feasibility → evaluation → implementation, reflecting the iterative and stepwise approach increasingly expected in CIHR-funded intervention research. Complex interventions, such as behavioural programs, digital health interventions, nurse-led care models, and health system innovations, require more than a traditional trial mindset. They must be theoretically grounded, context-sensitive, feasibility-tested, rigorously evaluated, and designed with implementation and scale-up in mind. This course trains students to think across that full pathway. Through lectures, readings, class discussion, logic model development, feasibility design exercises, trial critique, and a full-day design workshop, students will learn how to design doctoral and grant-level research aligned with the MRC framework and implementation science principles.