National 4 covers the three standard units - Engineering Contexts and Challenges, Mechanisms and Structures, and Electronics and Control. Each unit has a set of assessment tasks that must be completed and passed. The final assessment is the Added Value Unit which combines skills from the three units which must be completed and passed to achieve the course award.
National 5 covers the three standard units - Engineering Contexts and Challenges, Mechanisms and Structures, and Electronics and Control. There is a final exam which covers content from the units which is 110 marks (69%) and a course Assignment which covers skills from across the course and completed using software to solve an engineering problem, which is 50 marks (31%).