{"id":"pareto-chart","model_id":"Pareto chart","name":"Pareto chart","summary":"A Pareto chart displays data to prioritize problem-solving. It combines a bar chart showing the frequency of occurrence of a series of causes with a line chart showing the cumulative percentage of the same causes.","study_notes":["The term comes from Vilfredo Pareto (1848-1923), who coined the 80/20 rule.","Pareto’s first statement of the rule was based on the discovery that 80% of wealth in societies was controlled by 20% of the population.","Joseph Juran later extended the 80/20 rule to quality problems in 1941, finding that 80% of a problem is typically caused by 20% of the possible causes.","The document states that the 80/20 rule seems to find application in practically every activity."],"safety_notes":[],"sources":[{"url":"https://www.lean.org/lexicon-terms/pareto-chart/","title":"Pareto Chart - Lean Enterprise Institute","accessed":"2026-10-25"}],"verification":{"status":"source_checked","checked_at":"2026-10-25","values":2,"method":"llm_source_check"},"updated_at":"2026-10-25","type":"operational","spec":{"kind":"methodology","origin":"Vilfredo Pareto (1848-1923)","related":[]},"url":"https://machineschema.com/operational/pareto-chart","license":"https://creativecommons.org/licenses/by/4.0/"}