Which of the following charts is designed to monitor variation over time in a process?

A run chart is designed to display data points in time order so a team can monitor variation and trends in a process over time. In software quality engineering, run charts can track defect counts, defect arrival rates, build failures, response times, review findings, cycle time, or customer-reported issues across days, weeks, releases, or iterations. They help identify shifts, trends, cycles, unusual points, and process instability. A Gantt chart is used for project scheduling and task timelines. A Pareto chart ranks categories from most frequent or significant to least. A radar chart compares multiple variables across categories, often against targets. Because the question focuses on variation over time, the run chart is correct.