Category Archives for Qualitypedia

Kano Model by Noriaki Kano

The Kano model was developed by Noriaki Kano. It classifies the attributes of a product into three groups. 1. Basic or Threshold Attributes. Customers assume that these attributes will be present. If they are not present or are of low quality, customers will be dissatisfied. If they are present, customers’ satisfaction will not increase. Example: […]

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Defect – Definition and Causes

What is a Defect? A flaw or weakness in a system that causes the system to fail Non-conformance to a standard A disorder in the system or process which can cause a failure or discrepancy in the delivery of product or services. Expectations are not meet. A defect can be seen as an opportunity for […]

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Quality Assurance (QA) vs. Quality Control (QC)

There is a lot of misunderstanding when it comes to Quality Assurance and Quality Control. Many times these two terms are used interchangeably. This post summarizes the similarities and differences between Quality Assurance (QA) and Quality Control (QC). Let’s start with the official definitions of Quality Assurance and Quality Control as defined in ISO 9000:2015.Quality Control:Part of […]

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Causes of Poor Quality

Root Cause Analysis – Online Training$130 course for just $13.99 today!8+ hours of videos, slides & quizzes $135 $14 Poor QualityQuality is the most important part of any business. It’s the backbone of a company. Competition is very high. Despite all quality models and methodologies out there, most of the companies face the problem of poor […]

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Understanding Quality – Definitions and Dimensions

The challenge in defining quality is that it is a subjective concept, like beauty. Everyone has a different definition based on their personal experiences. Definitions The totality of characteristics of an entity that bear on its ability to satisfy stated and implied need. Quality is the ongoing process of building and sustaining relationships by assessing, […]

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History of Quality

22 January 1901 Sir John Wolfe-Barry (the man who designed London’s Tower Bridge) instigated the Council of the Institution of Civil Engineers to form a committee to consider standardizing iron and steel sections. 1911 Frederick W. Taylor published “The Principles of Scientific Management.” 1924  Walter A. Shewhart, a statistician at Bell Laboratories, developed the control charts, and principles of […]

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Seven Quality Tools – Scatter Plot

Sometime around 1950, Quality Guru Ishikawa proposed seven basic quality tools. One of these seven tools was the Scatter Plot. Scatter plot is used to show the relationship between two variables visually. The simple academic example could be to show the relationship between the outside temperature and the ice cream sale. The scatter plot could […]

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5 S

A 5-step process for organizing and standardizing the workplace, summarized by five words or phrases beginning with S: Seiri (Sort) Seiton (Set in order) Seiso (Shine) Seiketsu (Standardize) and Shitsuke (Sustain) It is a methodology for creating a clean, safe, orderly, high performance work environment.

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AOQ – Average Outgoing Quality

Average Outgoing Quality (AOQ): The expected average quality level of an outgoing product for a given value of incoming product quality.AOQ plot represents the relationship between the quality of incoming and outgoing materials. When incoming lots are very good, the outgoing quality will be good.When the incoming lot is very bad, then also the outgoing quality […]

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Average Outgoing Quality Limit AOQL

  ​Average Outgoing Quality (AOQ) plot represents the relationship between the quality of incoming and outgoing materials. When incoming lots are very good, the outgoing quality will be good.When the incoming lot is very bad, then also the outgoing quality will be good because poor lots get reinspected and fixed. See the graph showing the relationship between […]

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Dodge Romig Sampling Plans

Plans for acceptance sampling developed by Harold F. Dodge and Harry G. Romig. Four sets of tables were published in 1940:single sampling lot tolerance tables,double sampling lot tolerance tables,single sampling average outgoing quality limit tables anddouble sampling average outgoing quality limit tables. ​The above video is from my ASQ CQE exam preparation course. To learn Acceptance […]

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