SEVEN BASIC TOOLS OF QUALITY

SEVEN BASIC TOOLS OF QUALITY

1. CAUSE AND EFFECT DIAGRAMS

   • Factors contributing to defect
     • Measurements
     • Materials
     • Personnel
     • Enviroment
     • Methods
     • Machines
   • Characteristics
     • Shows causes of the problem
     • Brainstormin complement
     • Is a graphical analysis

2. PARETO CHARTS

   • Characteristics
     • Contains bars and lines
     • Frequency and Cumule frequency are plotted
     • 80 % problems = 20 % causes

3. FLOW CHARTS

   • Graphical representation of a process
   • Activities step by step
   • Decision
   • Types
     • Horizontal
     • Vertical
     • Panoramic
     • architectural

4. CHECK SHEET

   • Types
     • According to the data
       • Tally Sheet (Quantitative)
       • Check Sheet (Qualitative)
     • According to the information
       • Classification
       • Location
       • Frequency
       • Measurement Scale
       • Check List

5. SCATTER PLOTS

   • Characteristics
     • Set of points
     • Used to measure a controlled variable
     • Shows the correlation between 2 variables
   • Types of correlations
     • Positive
     • Negative
     • Null

6. CONTROL CHARTS

   • Characteristics
     • Known as Shewhart charts
     • Determines whether production is acceptable or not
     • Predicts the future perfomance of the process
     • Help to determine the sources of variation

7. HISTOGRAMS

   • Characteristics
     • Are used to plot density of data
     • showing a visual impression of data
   • Types
     • Absolute frequency
     • Relative frequency