Quality tools are more specific - tools which can
be applied to solving problems in improving
quality in organizations, manufacturing, or even
in individual processes.
They were first emphasized by Kaoru Ishikawa,
professor of engineering at Tokyo University and
the father of “quality circles”.
Seven Basic Quality Tools
A histogram is a bar graph that shows frequency
Histograms provide the easiest way to evaluate
the distribution of data.
The Pareto Chart is a histogram
ordered by the frequency of result
occurrences, showing how many
results were generated by the type
or category of the identified cause.
The relative position of the occurrences
is used to guide corrective actions.
• The corrective actions must initially focus on
the problems that are causing the majority of
A flowchart is any chart that
depicts how several elements
interact with each other
Control charts present the results of a process over time.
They are used to determine if the process is under control.
They are used to monitor any type of variable output.
Can be used to monitor
Cost and schedule variances;
Volume and frequency of changes;
Errors in the project documentation
• A run chart, also known as a run-sequence
plot is a graph that displays observed data in
a time sequence. Often, the data
displayed represent some aspect of the
output or performance of a manufacturing or
other business process.
A simple run chart showing data collected over time.
The median of the observed data (73) is also shown
on the chart.
Scatter Diagrams are used to study and
identify the possible relationship
between the changes observed in two
different sets of variables.
A concept map is a diagram that depicts
suggested relationships between concepts.
a simplified way to organize a story or idea into
It is typically represents ideas and information as
boxes or circles, which it connects with labelled
arrows in a downward-branching hierarchical
It is a list with
options that are
used as a guide to
It allows a
evaluation in a
short period of
Pie chart diagrams
also called circle graphs
type of graphic organizer that is useful for
displaying information about the percentages
or parts of a whole.
is a graphic organizer that is made up of two or three
overlapping circles. In mathematics, Venn diagrams
are used to visualize the relationship between two or
three sets. Venn diagrams can also be used to
compare and contrast the characteristics of any other
items, like groups of people, individual people, books,
characters, animals, etc.
Jalyn C. Refugio