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Seven Tools of Quality

In: Business and Management

Submitted By raijin
Words 296
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Cause & effect
One of the seven tools of quality, it shows the relationship of all factors (causes) that lead to the given situation (effect). It identifies major causes and breaks them down into sub-causes and further sub-divisions (if any). It is usually preceded by cause-and-effect analysis. Also called fishbone diagram (because of its resemblance to a fish skeleton) or Ishikawa diagram, after its inventor Dr. Kaoru Ishikawa (1915-89) of Tokyo's Mushasi Institute.

flow chart a diagram of the sequence of movements or actions of people or things involved in a complex system or activity.

Check sheets
The check sheet is a form (document) used to collect data in real time at the location where the data is generated. The data it captures can be quantitative or qualitative. When the information is quantitative, thecheck sheet is sometimes called a tally sheet.

Histogram a diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval.

Pareto charts
A Pareto chart, named after Vilfredo Pareto, is a type of chart that contains both bars and a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line.

Control charts
The control chart is a graph used to study how a process changes over time. Data are plotted in time order. A control chart always has a central line for the average, an upper line for the upper control limit and a lower line for the lower control limit. These lines are determined from historical data.

Scatter diagram a graph in which the values of two variables are plotted along two axes, the pattern of the resulting points revealing any correlation present.

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