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Quality Management Tools - Coggle Diagram

- - - - Tally
        
        Counts the occurrences of defects (frequency) to find the cause of a problem
        
        specific period of time
        
        May be additional categories to break the issue down
      - Defect Location
        
        Uses sketch, illustration or picture to pinpoint the location of defects
      - Measurement Scale
        
        every item is recorded to confirm a range of results
  - - - Pareto principle: 80:20 ratio e.g. 80% of complaints come from 20% of consumers
        
        Vital few - few categories that dominate the ranking
        
        Trivial many - remaining categories with lower priority issues
  - - - Visualise process variability and set limits of acceptability
  - - - Can determine cause and effect or see if two variables are related
        
        However, correlation vs. causation must be taken into account
  - - - Graphical representation of numerical quality characteristic v. the sample no. or time
        
        has horizontal lines which are the control limits
        
        the cause fo any out of control readings should be identified and managed
- - - - Production or process classification
        
        Emphasis on possible cause in sequence of known processing steps
        
        Primary
        
        Major causes represented as the ribs
        
        Secondary
        
        Secondary cause - represented as large bones coming off the ribs
        
        Tertiary
        
        minor causes - small bone coming off the secondary causes
      - Cause enumeration
        
        Lists all the causes first then categorises them
      - Dispersion analysis
        
        starts with problem description
        
        Identifies major causes and then lists minor causes under these
  - - - Generate Ideas
      - Sort ideas into groups
      - Create header cards
      - Draw finalised diagram
      - Display ideas on cards/ post its
  - - - Generate ideas
      - Display ideas
      - Draw directional arrows
      - count the enter/ exit arrows
      - Arrows entering but not leave = root effect
      - Arrows exiting but not leave = root cause/ idea