Use these tools to collect, display and analyse data for your quality improvement project. Each tool explains when and how to use it, with a downloadable template for your own data.
Basic statistics
Calculate mean, median, mode, range and standard deviation for your data.
Histogram
Display the frequency distribution of your data.
Pareto chart
Rank problems by frequency to find the vital few.
Run chart
Track a measure over time and test whether change is improving the process.
Tally sheet
Capture how often events occur in real time, ready for analysis.
Scatter plot
Plot two variables and see whether a relationship exists between them.
Statistical process control chart
Distinguish common cause variation from special cause in process data.