Explore the intricacies of requirements engineering in this comprehensive lecture by Bertrand Meyer, recipient of the ACM Software System Award. Delve into the "Four PEGS" approach, designed to bridge the gap between theory and practice in software requirements. Learn about a new standard plan for requirements specifications, intended to replace the outdated 1998 IEEE standard. Gain insights into precise definitions of requirements concepts, practical guidelines for industry implementation, and the importance of balancing traditional and agile methodologies. Discover how this innovative approach aims to strengthen the often-weak link in software engineering, covering topics such as requirements quality, management, sources, and lifecycle integration. Benefit from Meyer's extensive experience as he presents ongoing work to improve requirements engineering practices across the industry.