At that time, the concept was beginning to expand from the then-prevailing after-the-fact inspection, or “detection”, to what we now call “prevention”. Juran’s trilogy consists of Quality Planning, Quality Control, and Quality Improvement. Juran's management theory affected the quality control in engineering. In 1941, Juran stumbled across the work of Vilfredo Pareto and began to apply the Pareto principle to quality issues (for example, 80% of a problem is caused by 20% of the causes). Quality control is the third universal process in the Juran Trilogy. The Juran Quality Trilogy. The term “control of quality” first emerged in the early part of the twentieth century. Juran was the first to incorporate the human aspect of quality management which is referred to as Total Quality Management. The process of developing ideas was a gradual one for Dr. Juran. The Juran Trilogy, also called Quality Trilogy, was presented by Dr. Joseph M. Juran in 1986 as a

Merriam-Webster defines it as “degree of excellence” or “superiority in kind,” while Oxford opts for “the standard of something as measured against other things of a similar kind; the degree of excellence of something.” His book, "Quality Control Handbook," is a classic in the field. This is also known as "the vital few and the trivial many." In later years, Juran preferred "the vital few and the useful many" to signal that the remaining 80% of the causes should not be totally ignored. Juran's quality theory impacted the Japanese economy after WW2. One of the first to write about the cost of poor quality, Juran developed an approach for cross-functional management that comprises three legislative processes: Quality Planning: This is a process that involves creating awareness of the necessity to improve, setting certain goals and planning ways to reach those goals. Joseph Juran was a pioneer in the study of quality control. Why is Quality Control Needed? Juran July 1, 2019 Knowledge Dictionary definitions of the word “quality” cover fairly similar ground.