A 3-pronged approach to managing quality is the

The quality trilogy, or Juran trilogy, is a 3-pronged approach to managing quality proposed by Joseph Juran;
朱兰三部曲（Juran Trilogy）或品质三部曲（Quality Trilogy） 每个企业、每种产品和服务，要想在国际市场上占有一席之地，都要面对“超严格的质量要求”，要努力使自己达到世界级的质量水平。
Juran trilogy, it＇s is a system based approach to quality improvement. The three elements of the approach are : Quality Planning, Quality Control and Quality Improvement.
1) Quality Planning: The steps of the quality planning exercise are: - Definition of the project. - Identification of the customers – those who will be impacted by the actions that are taken to complete the project. - Discovery of customer needs. - Development of the product and processes to meet the customer’s needs. - Establishment of the quality objectives. - Development of the plans for meeting these objectives
2) Quality Control; It entails the following steps: - Clear definitions of quality. - Knowledge of the expected performance or targets. - Evaluation of the actual operating performance. - Comparison of the actual performance to goals. - Action of the difference.
3) Quality Improvement; As per Juran Tribology, quality improvement is a disciplined approach that improves the level of performance of the process. This is achieved by a breakthrough improvement in performance; when a new innovation or a completely fresh idea is brought into improve the current performance levels. This ensures that the new levels of performance are achieved, and then quality control mechanisms are in place to sustain that effectively