保持测量系统的稳定性是质量控制的重要内容之一。本文在分析了累计和控制图和传统休哈特控制图的基础上，指出了传统休哈特控制图的不足，提出将累计和控制图应用于测量系统稳定性的控制。理论研究和案例分析均表明，当测量系统引起的被测质量特征值的均值发生小幅度偏移时，用累计和控制图比休哈特控制图更有效。

本文在大量调研的基础上，对我国制造业质量管理现状进行了分析，剖析了当前我国制造业质量管理中的主要问题及其原因，提出了提高我国制造业质量管理水平的策略。对我国制造业质量管理水平的提高具有现实意义。

多变异分析是一种用于分析工序过程质量特征值变异规律的重要方法。本文分析了传统控制方法的不足，利用多变异分析的统计模型，提出了基于多变异分析的工序控制方法，对多变异情形下工序质量控制具有一定的指导意义。

During process design or process optimization, it is quite common for experimenters to find optimum operating conditions for several responses simultaneously. The traditional multiresponse surfaces optimization methods do not consider the uncertain relationship among these responses sufficiently. For this reason, the authors propose an optimization method based on evidential reasoning theory by Dempster and Shafer. By maximizing the basic probability assignment function, which indicates the degree of belief that certain operating condition is the solution of this multiresponse surfaces optimization problem, the desirable operating condition can be found.

Continuous quality improvement is now the focus of research and application in quality engineering. To achieve continuous improvement, it's necessary to integrate quality tools and to plan, design and control the whole process of creating quality. Based on the extensive literature review and the philosophy of concurrent quality engineering, the paper analyzes the relationships among major quality tools such as QFD, FMEA, DOE and SPC and presents a basic model and structure for the integration of quality tools.