LEAN+: 7 Tools of Quality

LEAN+: 7 Basic Tools of Quality   The term Seven Basic Tools of Quality relates to the graphical statistical techniques which require little formal training in statistics. Seven Basic Tools of Quality are considered the most effective methods in illustrating and resolving vast majority of issues related to quality. The 7 Basic Tools of Quality Control are:

  1. The flowchart – a type of diagram showing the steps as boxes of various kinds, and their order by connecting these with arrows which may illustrate a step-by-step solution to a given problem and usually represents flow of data. Flowcharts are used in analyzing, designing, documenting or managing a process or programs.
  2. The check sheet – a simple document that is used for collecting data. The document is typically a blank form designed for the quick, easy, and efficient recording of the desired information, which can be either quantitative or qualitative. Data is often recorded on the check sheet by making marks (“checks”) on it, hence the name.
  3. The Pareto chart – a chart where individual values are represented in descending order by bars, and the cumulative total is represented by the line. The left vertical axis represents usually the frequency of occurrence or another value. The right vertical axis is the cumulative percentage of the occurrences or total of another values. The purpose of the Pareto chart is to highlight the most important among contributing or measured factors.
  4. Ishikawa diagram (fishbone diagram, cause-and-effect diagram, CE diagram) – a diagram that show the causes of event. Causes are usually grouped into major categories. The basic categories include: Man( People), Method (Process), Machine (Equipment), Material, Measurement, Environment.
  5. The histogram – a graphical display of tabular frequencies shown as adjacent rectangles  with an area proportional to the frequency of occurrence or value. Histograms are used to illustrate the density of data.
  6. The control chart (run chart, xbar/R, Shewhart chart or process-behaviour chart) – determines whether or not a process is stable, with variation only coming from sources common to the process. In statistical process control this chart can be used to predict the process, determine the sources of process variation and change process control parameters.
  7. The scatter diagram (correlation diagram, scatter chart, scatter graph) – an illustration of values for two variables for a set of data. The data is displayed as points, each having the value of one variable on the horizontal axis and the value of the other variable on the vertical axis. Used to determine the correlation between the variables and to show nonlinear relationships between variables.

Quexx International Ltd. consultants are dedicated to providing you with exceptional quality services. Extensive experience and expertise of our consultants offers consulting services which are tailored to suit your needs and your unique work environment. QUEXX consultants were trained by Toyota Motor Corporation, a World leader in Continuous Improvement and have hands-on experience in implementing LEAN techniques of Toyota Production System. For more details please refer to Quexx Training Guidelines .

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