To facilitate decisions in a strategic analysis context or in the case of business process improvement, it is necessary to go back to the source of the issues we are seeking to solve.

The cause-and-effect diagram (also called Ishikawa diagram or fishbone diagram) is a tool that enables identification of the possible causes of an observed effect and therefore determination of a means of solving the issues.

The cause-and-effect diagram is particularly useful for displaying the results of brainstorming sessions.

Having drawn a cause-and-effect diagram, it is possible to determine objectives and to carry out projects to solve the identified issues.