What is a QC story?
The QC story, also called the quality improvement story, is a standard seven-step method for team problem solving that grew out of the Japanese QC circle movement. It turns the PDCA cycle into concrete steps that a shop-floor team can follow and present. The "story" matters: a well-told QC story shows not just what was improved but how the team reasoned from facts to causes to countermeasures, so other teams can reuse both the solution and the thinking.
The seven steps of the QC story
| Step | PDCA | What to show | Typical tools |
|---|---|---|---|
| 1. Select the theme | Plan | The problem and why it was chosen | Pareto chart, company policy |
| 2. Grasp the situation, set the target | Plan | Facts by type, place and time; a measurable target | Check sheet, stratification, graphs |
| 3. Analyze the causes | Plan | Possible causes and those verified with data | Fishbone, scatter diagram |
| 4. Plan and implement countermeasures | Do | One countermeasure per verified cause, with a 5W1H plan | Countermeasure matrix, action plan |
| 5. Check the effects | Check | Result against the target (same graph as step 2), savings, intangible benefits | Histogram, control chart |
| 6. Standardize | Act | Changed standards, training, monitoring | Standard work, control charts |
| 7. Reflect and plan next | Act | Lessons learned and the next theme | Reflection table |
QC story example
A paint shop QC circle picks dust defects as its theme: they are 52% of paint rework (step 1). The defect rate is 4.8%, concentrated on upper surfaces and after breaks; the target is 2.0% by July (step 2). Particle counts and observation confirm three causes: booth pressure lost when doors open, skipped tack-cloth wiping on rush orders and a worn filter (step 3). The circle interlocks the doors with the conveyor, adds a tack-cloth check on the jig and changes filters by pressure drop (step 4). The rate falls to 1.6%, saving about $60,000 a year (step 5). The new break procedure and filter rule are written into the standards (step 6), and the next theme is orange peel on dark colours (step 7).
Tips for a good QC story
- Choose a theme the team can influence, inside its own work area.
- Stratify before you analyse. Knowing where and when the problem happens narrows the causes.
- Verify causes with data before choosing countermeasures.
- Use the same metric and graph in steps 2 and 5, so the effect is clear at a glance.
- Count intangible effects too: skills, teamwork and motivation are part of the result.
How to use this QC Story tool
- Name the team. Click the team card and enter the QC circle, members, facilitator and period.
- Select the theme. Click step 1 and write the theme and why it was chosen.
- Grasp the situation and set the target. In step 2, describe the current situation with data and enter the metric, its baseline and target.
- Analyze and act. In step 3, record the verified main causes; in step 4, the countermeasures and the 5W1H plan.
- Check the effects. In step 5, enter the after value: the storyboard shows before, target and after side by side.
- Standardize, reflect and export. Record the standards and training in step 6, reflections and the next theme in step 7, then export the story.
Frequently asked questions
What is a QC story?
A QC story (quality control story, or quality improvement story) is a seven-step problem-solving procedure developed in Japan for QC circles. It walks a team from choosing a theme to standardizing the solution, and is presented as a story so others can learn from it. It is the PDCA cycle, broken into steps a shop-floor team can follow.
What are the 7 steps of the QC story?
1 Select the theme, 2 Grasp the current situation and set the target, 3 Analyze the causes, 4 Plan and implement countermeasures, 5 Check the effects, 6 Standardize, 7 Reflect and plan the next theme. Some versions split step 2 or add an activity plan, giving 8 or 10 steps.
What is a QC circle?
A QC circle is a small group of employees, usually from the same work area, who meet regularly to solve problems in their own work using quality tools. QC circles were started by Kaoru Ishikawa and JUSE in Japan in 1962 and spread worldwide as quality circles or small group activities.
Which tools are used in a QC story?
Mostly the seven basic quality tools: check sheets and stratification to grasp the situation, Pareto charts to choose the focus, fishbone diagrams and scatter diagrams to analyse causes, histograms and control charts to check effects and hold the gain.
How is a QC story different from an A3 or 8D?
All three follow PDCA. The QC story is team-centred and designed for QC circles and improvement conventions, with emphasis on learning and intangible benefits. A3 is a one-page report owned by one person. 8D is a customer-complaint response with containment and escape analysis.
How do you present a QC story?
Present the seven steps in order, with one or two charts per step, using the same metric and graph in step 2 (before) and step 5 (after) so the effect is obvious. End with what the team learned and its next theme. Export the storyboard from the tool as a PNG or PDF for the presentation.