seven tools of quality



Devices used in understanding and improving production processes. Tool 1: Cause and effect diagram visual representation of the main causes and sub-causes leading to an effect or symptom, also called fishbone diagram (after its shape) or Ishikawa diagram (after its inventor). Tool 2: Check sheet data recording table (matrix) designed by the user to facilitate the recording and interpretation of test results. Tool 3: Control chart visual representation of comparison between actual performance and pre-determined control limits; helps in detecting assignable causes of variation, also called C chart. Tool 4: Flowchart visual representation of relationship between planned performance and actual performance over a period. Tool 5: Histogram graph of side-by-side vertical bars representing a frequency distribution; it reveals patterns that remain hidden in tables of numbers, sometimes it is substituted or supplemented with a Gantt chart. Tool 6: Pareto chart based on Pareto principle (a small percentage of the elements comprising a group accounts for the largest fraction of the value or the impact), it ranks causes from the most significant to the least significant. Tool 7: Scatter chart graph that displays the relationship between two variables; the variable to be predicted (dependent variable) is plotted on the vertical ('Y') axis, and the variable used to make the prediction (independent variable) plotted on the horizontal ('X') axis.

Related Videos

Have a question about this term? Ask for help in the
advertise here

Browse by Letter: # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z