9 quality-tools(2)
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9 quality-tools(2)

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9 quality-tools(2) 9 quality-tools(2) Presentation Transcript

  • IntroductionIn the following we will Examine the Techniques and Tools that Support Quality Management within a company. There are for the 7 Basic Tools which we are going to define. Generally they can be subdivided into:  mathematical statistical Tools  logical tools
  • Quality tools Quality techniques  7 Basic Quality techniques  Histograms  Pareto Charts  Run Charts  Scatter Diagrams  Control Charts  Flow Charts  Cause and Effect Diagrams  New techniques  Other Tools
  • LSL USLHistogramsWhat is it? • A Histogram is a bar graph • usually used to present frequency dataHow does it Work? • Define Categories for Data • Collect Data, sort them into the categories • Count the Data for each category • Draw the Diagram. each category finds its place on the x-Axis. • The bars will be as high as the value for the categoryWhat is its use? • Histograms provide an easy way to evaluate the distribution of Data over different categories
  • Pareto Charts XWhat is it? • A Pareto Chart is a Histogram • + a cumulative line TypeHow does it Work? • Similar like a Histogram • First define categories, collect Data and sort them into the Categories. Count the occurrences for each category. • Now rank the categories starting with highest value. • Draw cumulative points above all the bars and connect them into a line.What is its use? • Pareto Charts are used to apply the 80/20 rule of Joseph Juran which states that 80% of the problems are the result of 20% of the problems. A Pareto Chart can be used to identify that 20% route causes of problem.
  • Run Charts MeasurementWhat is it? • Run Charts are representing change • in measurement over a sequence or timeHow does it Work? Time • Gather Data • Organize Data » Measurements (y) must be confronted with time or sequence of the events. • Chart Data • Interpreting DataWhat is its use? • Determining Cyclic Events and there average character
  • Scatter DiagramsWhat is it? • Statistical tool showing a trend in a series of values.How does it Work? • Gain values series • Draw graph with value points Y • Draw trend line: m*x+a » Calculate m value » Calculate a value » Calculate points for trend line. XWhat is its use? • Demonstrating correlations between values and showing trends for value changes.
  • Control Charts Y Upper limit Average/SpecWhat is it?• Statistical tool, showing whether Lower limit• A process is in control or notHow does it Work? X• Define Upper limit, lower limit and medium value• Draw Chart.• Gather values and draw them into chartWhat is its use?• Taking samples of a process and detect possibility of process being out of control
  • startFlow Charts No Repair machine Check machine OK?What is it? Yes• Way of representing a Procedure end• using simple symbols and arrows• A Flowcharts shows the activities in a process and the relationships between them. Operations and Decisions can be representedHow does it Work? • Determine what Process or Procedure you want to represent. • Start at a certain point and go then step by step using circles or rectangles for operations or other elements, diamonds for decisions, arrows show the flow and the direction. • Document the elements with titles. Let it close with an ending point.What is its use? • A Flow chart lets a process or procedure be understood easily it also demonstrate the relationships
  • Cause and Effect Diagrams Cause a Cause bWhat is it? • It’s a diagram that demonstrates effect • the relationship between Effects • and the categories of their causes Cause c Cause d • The Arrangement of the Diagram lets it look like a fishbone it is there for also called fish-bone diagramHow does it Work? • Determine the Effect or Problem you would like to examine • Categorize the possible causes • find subcategories • Describe the possible causes