The risk-based designRisk-based design approach represents a transformative shift from prescriptive design rules to goal-based solutions. The offshore petroleum enterprises have expressed their enthusiasm for supporting this promising design approach. This lesson starts with exploring the need and challengesChallenges underlying the implementation of risk-based design. Then, the lesson outlines regulatory requirements for risk-based designRisk-based design and clarifies its relationship with risk modellingRisk modelling. A focus is placed on the safety integrityIntegrity level (SIL), which serves as a measure of the level of risk reductionRisk reduction provided by a safety function or the reliability of a safety system. Finally, practical considerations for risk-based design in the contextContext of accidental loads are discussed. This lesson aims to equip readers with a comprehensive understanding of risk-based designRisk-based design principles and their practical applications.