Run Chart

Introduction: Run Chart

A Run Chart is a simple but powerful graphical tool used in quality management and process improvement. It displays data points in chronological order, making it easy to identify patterns, trends, and shifts in process behaviour over time. By doing so, it helps evaluate stability and detect potential issues early.

Background

Run Charts originated as part of statistical process management methods and are widely used in Lean, Six Sigma, and healthcare quality improvement. Unlike more complex control charts, a Run Chart does not include control limits, making it straightforward to construct and interpret while still providing meaningful insights into process performance.

Key Elements/Features

• Process stability: Reveals whether a process operates consistently within expected variation.
• Trend detection: Identifies upward, downward, or steady movement in data.
• Seasonality: Highlights repeating cycles, such as monthly or seasonal effects.
• Special causes: Shows unusual shifts or outliers that may indicate external influences or internal changes.
• Time-based data: Uses sequential measurements (daily, weekly, monthly) to support decision-making.

Applications/Examples

Run Charts are widely used across industries. In healthcare, they track infection rates or waiting times. In manufacturing, they monitor defect levels over shifts or weeks. In service industries, they can show call response times or customer satisfaction scores. For example, if monthly complaints suddenly spike, a Run Chart makes the change visible for investigation.

Relevance/Impact

The simplicity of Run Charts makes them highly accessible. They support continuous monitoring, enable early detection of problems, and help organisations evaluate whether process changes have had the desired effect. This encourages data-driven decisions, timely interventions, and continuous improvement.

See also

• Control Chart
• Statistical Process Control (SPC)
• Time Serie Analysis
• Ocap