Statistical Process Control (SPC) Tools - 7 Basic Tools

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Statistical Process Control (SPC) Tools - 7 Basic Tools

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Statistical Process Control (SPC) Tools - 7 Basic Tools

  1. 1. SPC - 7 BASIC TOOLS 2013.10.22 By ML
  2. 2. STATISTICAL PROCESS CONTROL (SPC)-7 BASIC TOOLS 1. 2. 3. 4. 5. 6. 7. Check Sheet Stratification Scatter Diagram Histogram Pareto Chart Control Chart Cause and Effect Diagram
  3. 3. CHECK SHEET Data record Checklist Develop a matrix for data collection. To list all necessary items and their status.
  4. 4. STRATIFICATION ANALYSIS Stratification Variables To group your data by a stratification variable. Stratification Tables Summary Statistics by Groups or Levels of an Output. „ Common Summary Statistics include: „Mean, Standard Deviation, Sums, Counts Graph chart Bar Graphs / Pie Charts / Flow Chart / Contingency table. Advanced chart Stratify distributions using multiple histograms or multiple box plots
  5. 5. SCATTER DIAGRAM EXPLAIN THE RELATIONSHIP BETWEEN.. …X and Y
  6. 6. HISTOGRAM Normal manufacturing process, normal quality Limitation Data from difference sources.
  7. 7. HISTOGRAM VS. BAR GRAPH Histogram Size, shape and the density of interval. Normal manufacturing process, normal quality Bar chart (bar graph) Height The distribution of research subject.
  8. 8. CREATING HISTOGRAM 1. Collecting input data (n>50). 2. Define K (base on sampling size, density of the bin, narrow the interval) Either the experience or use the formula K=1+3.32*log(n) 3. Define I the Range : R=Xmax – Xmin i= R/ K (take the odd number) 4. Bin range L = Xmin-(unit/2), U=L+I …apply to other number, till > Xmax 5. On the Tools menu, click Data Analysis. 6. In the Analysis Tools box, click Histogram, and then click OK.
  9. 9. REVIEW THE 4 BASIC TOOLS Check Sheet A systematic and constantly, data record collection. Stratification Category the cause of variation, distinct the difference. Cause and effect relationship Scatter Diagram To find out the relationship of two variables. Cause and effect relationship Histogram Represent tabulated frequency, often for density estimation. Problem identification Problem identification Problem identification Cause and effect relationship  we found the process in red circle is  Clarify with the issue ‘X’, does it associate with factor ‘Y’; the major problem.  the other way is to stratify the process  we noticed that its not a normal which in red circle. distribution thru histogram chart.
  10. 10. CAUSE AND EFFECT DIAGRAM Measurement Materials Method Analytical procedure Sampling
  11. 11. REVIEW THE OTHER 3 BASIC TOOLS Pareto Chart 80-20 rule. Control Chart With comparing lines, to find and correct the process variation when unpredictable (out of control). Cause and Effect Diagram The fishbone diagram identifies many possible causes for an effect or problem. It can be used to structure a brainstorming session. It immediately sorts ideas into useful categories.
  12. 12. ADDRESS YOUR CONCLUSION Follow MECE Principle mutually exclusive and collectively exhaustive South East East North Seattle East ← → ↑ Grouping Find what’ve been missing East South ↓ North ↑ Seattle West North ← Blue West Blue west south north direction Summarizing West→ East West South North

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