This lecture introduces systems engineering, project management, and quality assurance in the context of space mechanisms. It covers the definition of a system, system decomposition, the V-model of systems engineering, project planning, requirements, verification and validation, and project documentation. The lecture also discusses the complexity of space projects, system architecture, lifecycle management, SE standards and handbooks, requirement definition, system design tradeoffs, and the importance of proper requirements. It explores the relationships among system design processes, common problems with requirements, requirements capture methods, verification, validation loops, types of documents, quality assurance, and documentation. The lecture concludes with a summary highlighting the significance of requirements, verification, validation, and traceability in systems engineering.