The QC 7 Tools consist of below:
• Cause and Effect Diagram
• Check Sheet
• Pareto Diagram
• Flow Chart
• Scatter Diagram
• Control Chart
In statistics, a histogram is a graphical display of
tabulated frequencies, shown as bars. It shows what
proportion of cases fall into each of several
categories. The categories are usually specified as
non-overlapping intervals of some variable. The
categories (bars) must be adjacent. The intervals (or
bands) should ideally be of the same size.
Cause and Effect Diagram
The Ishikawa diagram (or fishbone
diagram or also cause-and-effect
diagram) are diagrams, that shows the
causes of a certain event. A common
use of the Ishikawa diagram is in
product design, to identify potential
factors causing an overall effect.
The check sheet is a simple document that is used
for collecting data in real- time and at the location
where the data is generated. The document is
typically a blank form that is designed for the
quick, easy, and efficient recording of the desired
information, which can be either quantitative or
qualitative. When the information is quantitative,
the check sheet is sometimes called a tally sheet.
A Pareto chart is a special type of bar chart
where the values being plotted are arranged
in descending order. The graph is
accompanied by a line graph which shows
the cumulative totals of each category, left
to right. The chart is named after Vilfredo
Pareto, and its use in quality assurance was
popularized by Joseph M. Juran and Kaoru
A flowchart is common type of chart,
that represents an algorithm or
process, showing the steps as boxes
of various kinds, and their order by
connecting these with arrows.
Flowcharts are used in analyzing,
designing, documenting or managing a
process or program in various fields.
A scatter plot is a type of display to
display values for two variables for a set of
data. The data is displayed as a collection of
points, each having the value of one variable
determining the position on the horizontal
axis and the value of the other variable
determining the position on the vertical axis.
A scatter plot is also called a scatter chart,
scatter diagram and scatter graph.
The control chart, also known as the
Shewhart chart or process-behaviour
chart, in statistical process control is a
tool used to determine whether a
manufacturing or business process is in
a state of statistical control or not.