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Quality Control - Coggle Diagram

- - - - A designed to collect the necessary data easily and systematically
    - - Simplifying data collection and ensuring that no items are omitted when inspecting
    - - Understanding present situation
      - Investigating past and present situation
      - Clarifying the problems
      - Confirming effectiveness
      - Standardization and establishing control
  - - - To identify the major problem or concern for improvement
      - Focuses on causes that have greater impact if solved
      - Displays importance of the problems in a simple, easily interpreted, visual format
      - Making before and after comparison of a problem that has been solved
    - - Visual display of data to show the most significant problem, causes or situations
    - - Clarifying the problems
      - Understanding present situation
      - Setting targets
      - Confirming effectiveness
      - Investigating past and present situation
      - Investigate mutual relationships
    - - Decide items to study and collect data
      - Tabulate data based on the frequency of occurrences in each category and calculate totals. Arrange the data in descending order. Place ‘others’ item last (if applicable).
      - Calculate the percentage of total and
        cumulative percentage for each category.
      - Draw 2 vertical axis
  - - - Tool to identify, explore and graphically display, all of the possible causes related to a problem or condition to discover its root cause
    - - To recognize important causes
      - To understand all effects and causes
      - Creates a snapshot of the collective knowledge and consensus of a team around a problem.
    - - Clarifying the problems
      - Understanding present situation
      - Investigating causes and effects
      - Setting up the countermeasures
    - - Define the problem or effect to be analyzed.
      - Form the team to perform the analysis. Often the team will uncover potential causes through brainstorming.
      - Draw the effect box and the center line.
      - Specify the major potential cause categories and join them as boxes connected to the center line
      - Identify the possible causes and classify them into the categories in step 4. Create new categories, if necessary
      - Rank order the causes to identify those that seem most likely to impact the problem
      - Take corrective action
  - - - Plotting the shape of distribution and comparing it with specification
      - To show variability of process, product, material etc
      - To show the central tendency of a set of measurement
      - To illustrate whether product specs are met
      - To understand the characteristics of the population from which the sample are taken
    - - Clarifying the problem
      - Understanding present situation
      - Setting target
      - Analyzing cause
      - Setting up countermeasures
      - Confirming effectiveness
      - Standardization and establishing control
  - - - Finding correlation between paired set data
      - Supplies the data to confirm a hypothesis that two variables are related
    - - Investigating causes and effects
      - Stratification
      - Investigate mutual relationships
    - - 1.Collect at least 30 paired data(x,y) of the variables under study and enter data into check sheet
      - 2.Find the max and min values for both x and y values. Calculate range = max - min for both x and y variables. This will help decide the scales of horizontal and vertical axes, both length must be equal
      - 3.Draw horizontal and vertical axes. Decide the location for the two variables
      - If one is quality characteristic and the other is a factor, then use horizontal (x) axis for factor and vertical axis (y) for the quality characteristic.
        
        If one is a cause and the other is the effect then use x axis for cause and y axis for the effect
      - 4.Plot data on the graph paper. Repeated data values - put on the same point, mark by concentric circle
  - - - Purpose
        
        Easy to determine the trends/patterns.
        
        Visual display of data to achieve a deeper and quicker
        understanding of data.
        
        Easy to remember the information.
        
        Reveal hidden facts.
        
        Attracts attention of people viewing it.
      - When to use
        
        Understanding present situation
        
        Planning of activities
        
        Clarifying the problems
        
        Setting targets
        
        Investigating past and present situation
        
        Investigate temporal changes
        
        Setting up the countermeasures
        
        Confirming effectiveness
        
        Standardization and establishing control
      - LINE GRAPHS
        
        Showing the changes over time.
        
        A visual display of the pattern of data.
      - BAR GRAPH
        
        Showing the quantity of the variable being studied
        
        A visual display of the difference in quantity.
      - PIE CHARTS
        
        A visual display of the proportion of the different classification
  - - - Examining how various steps in a process are related to
        each other
      - Understanding processes by showing all the steps in the
        process.
      - Understanding processes by showing all the steps in the
        process
    - - Understanding present situation
      - Standardization and establishing control
  - - - Graph that have been measured & computed from sample
    - - Determine the process is in under control or not
      - Serve as an alarm for "on-going" control of a process
      - Determine when the process need to be adjust
    - - Clarifying problems, understand present situation, setting target, investigating temporal changes, confirming effectiveness, standardize & establishing control
    - - Shewchart, Exponentially Weighted Moving Average (EWMA), Cumulative Sum (CUSUM) & Multivariate
- - - - A device that measures the geometry of physical object
    - - Typically used as a measuring and measurement of various miniature mechanical and electronic parts.
    - - New with 4x measurement volume. It measure dimensions as specified heights while measure up to 99 dimensions in seconds.Automatic Data Recording and Inspection Reports.