Ishikawa Diagram

The Ishikawa Diagram (also called a fishbone diagram or cause-and-effect diagram) was created by Kaoru Ishikawa. It's a visual tool for systematically identifying and organizing the potential causes of a problem.

1. Define the problem — Write the problem statement at the "head" of the fish (right side).
2. Draw the backbone — Draw a horizontal arrow pointing to the problem.
3. Add major cause categories — Draw diagonal lines (bones) off the backbone. Common categories include:

• People — Skills, experience, staffing
• Process — Procedures, workflows, policies
• Technology — Tools, software, equipment
• Environment — Workspace, culture, external factors

1. Brainstorm specific causes — For each category, ask "Why does this contribute to the problem?" Add specific causes as smaller branches.
2. Dig deeper — Apply the "5 Whys" technique to each cause to find root causes.
3. Identify the most likely root causes — Analyze which causes have the biggest impact and focus on those.

• People: New team members unfamiliar with UX best practices
• Process: No A/B testing before deploying changes
• Technology: Page load time increased after last deployment
• Environment: Competitor launched a better pricing page

The Ishikawa Diagram helps you systematically uncover root causes rather than just treating symptoms. By organizing causes into categories, you ensure a thorough analysis and avoid overlooking important factors.