The Affinity Diagram is designed to invoke creative thinking
and organize qualitative information into related topics. It is the easiest and
least complex modern quality tool to begin the problem solving journey.
By breaking down large amounts of data and visualizing in
groups makes it is easier for the team to understand and analyze. Trying to
interpret everything at one time going from one topic to another can be chaotic
It is often used to analyze feedback from the Voice
of the Customer findings. There may be several customers that have
feedback related to one topic and others that have feedback on others. This
tool allows them to be grouped and studied by topic. This can also be used at
any time to organize a broad set of issues or opinions.
As with using most tools, using the Affinity Diagram begins with educating the team on the use and purpose of the tool.
It is a grouping technique that does not involve and quantitative analysis or ranking. It is a brainstorming exercise used within project management and most often in DFSS Six Sigma projects more than DMAIC Six Sigma projects.
Credit is given to Jiro Kawakita for development
of this tool in the 1960's. Therefore the Affinity Diagram is also referred to
as The KJ Method (not JK).
A large number of ideas from all team members are written in
silence or as group session and posted on a board or otherwise gathered.
Commonly, teams use notes and stick them to a board and they are moved around
into their respective categories as discussion takes place.
Once all notes are complete and gathered, the leader should
discuss each one briefly but enough so everyone understands it and can agree to
which topic or category to locate it in.
It is often that team members disagree on which topic to
place the note(s), many could fall in two or more categories. Make a copy of
the note and put in more than one category.
Topics include part, machine, delivery, quality,
form, tools, service, cost and the list can go on almost infinitely depending on the project.
Once the notes are organized into the general topics, it may
be desirable to break down the topic further. This is helpful when the topic is
very general and/or there are many notes in one topic and they are not closely
Many notes or statements may be identical, keep them all and
cluster them together under the related topic. There may be miscellaneous notes
that don't fall into one specific category. Group them together or
individually, ensure to value them as well as the others.
There are seven common project management tools that Six Sigma project managers should be familiar with:
1) Matrix Diagram
2) Tree Diagram
3) Process Decision Program Chart (PDPC)
5) Interrelationship Diagram (ID)
6) Affinity Diagram
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Cause & Effect Matrix
Central Limit Theorem
1-Way Anova Test
Correlation and Regression