Juran's Trilogy is a methodology for managing quality that involves three processes: quality planning, quality control, and quality improvement. It aims to continuously improve quality in all aspects of an organization. The methodology allows companies to understand relationships between each stage and use quality tools to implement the stages. Strengths include searching for continuous improvement and the ability to restart if goals are not met. Weaknesses include needing trained staff and focusing on processes rather than the workforce. Kaizen is a Japanese philosophy of continuous incremental improvement involving maintenance and improvement activities. It differs from innovation by aiming for small process improvements rather than dramatic changes. Business process reengineering fundamentally rethinks and radically redesigns processes to achieve dramatic performance improvements in areas like costs