Lean Six Sigma in Services: Examples from Hospitals and Government Agencies

What is Lean Six Sigma and why does it suit services?

The American Society for Quality (ASQ) defines Six Sigma as a method that gives organisations tools to improve the capability of their processes, and distinguishes it from Lean: Lean focuses on reducing waste, Six Sigma on reducing variation. Lean Six Sigma combines the two to reduce variation, waste and cycle time, and many implementations start with Lean and then apply statistical tools if process problems remain. ^[1]

Both approaches began in manufacturing, but the US Environmental Protection Agency describes Lean as a philosophy that has been extended to government and the service sector to help agencies identify and eliminate waste in their processes. ^[3] The difference in services is that the “product” is invisible: a patient file or licence application moving between offices, with nobody seeing how long it waits between one step and the next.

Where does waste hide in hospitals and government agencies?

The EPA guide uses the acronym DOWNTIME to remind teams of eight types of waste when observing day-to-day work. ^[3] The table below translates them into illustrative service examples:

The Institute for Healthcare Improvement (IHI) says the journey towards Lean begins with identifying the value-added and non-value-added steps in every process, and that waste includes money, time, supplies and goodwill. ^[2]

How do you apply DMAIC to a service project?

DMAIC is the most widely adopted Six Sigma methodology; its phases are define, measure, analyse, improve and control. ^[1] In services, each phase needs a practical translation:

• Define: state the problem in the service user’s terms, such as “time to issue a licence”, not in management language.
• Measure: record the baseline before any change; without it you cannot prove improvement.
• Analyse: walk with the file or the patient through the actual workplace (the gemba) and record where it waits, is returned or is reworked.
• Improve and control: test the solution on a small scale, then document it as standard work, the best currently known way of doing the job. ^[3]

What do documented hospital examples show?

In 2016 the American Hospital Association (AHA) published the case of a critical access hospital (a small rural hospital) that used Lean Six Sigma to improve patient flow in its emergency department. Mean time from the admission decision to the patient leaving the department fell by 40%, and patient and physician satisfaction rose by 12 percentile points. ^[4]

A study published in 2024 on an academic emergency department seeing around 100,000 patients a year mapped the value stream and redesigned the flow for less complex cases. Patients seen per eight-hour shift rose from 17 to 20.5, and the time from the attending physician’s assessment to the disposition decision fell significantly, as did the number of patients who left before treatment was complete or against medical advice. But the 9% fall in average length of stay was not statistically significant, and the authors noted that a single-centre before-and-after design cannot prove causation and that sustaining the new process after the trial ended was a barrier. ^[6]

The lesson is professional before it is statistical: separate what has genuinely improved from what only appears to have improved, and plan the control phase from the start.

What do government examples show?

The EPA’s 2013 guide documents results from US government bodies: ^[3]

• Florida Department of Environmental Protection: a kaizen event cut by 50% the time for a permit application to reach a processor.
• EPA Region 6: a value stream map of pesticides enforcement procedures cut total processing time by 53%.
• Minnesota Pollution Control Agency: a Six Sigma project raised the share of permits issued within 180 days from 9% to 75% and cut the backlog from nearly 50% to 8%.

The guide also notes that Minnesota state agencies held at least 265 kaizen and 5S events between 2008 and 2012, so improvement became a repeated practice rather than a one-off project. ^[3]

In a value stream mapping event as the guide describes it, the team maps the current state of the process from start to finish, identifies value-added time and waste, then maps the future state and draws up an implementation plan. ^[3] The common thread in these examples is that improvement came from rearranging steps and removing waiting and unnecessary approvals.

Which tool should you choose?

Not every improvement needs a full DMAIC project. If the cause is clear and the problem well defined, a kaizen event or even workplace organisation with 5S is enough. If the process is long and crosses several departments, start with a value stream map. If errors keep recurring and their cause is unknown, that is where Six Sigma’s statistical tools come in. ^{[1, 3]}

Hypothetical example: time to issue a trade licence

Hypothetical example: a local government body takes an average of 15 working days to issue a trade licence. Mapping the process, the team finds nine steps, three of them successive signatures on the same decision, and that the application spends most of its time waiting between steps rather than being worked on.

The team decides to merge the three signatures into one approval under delegated authority and to add a document checklist at intake to reduce returned applications, then measures the time weekly for three months. Results are reported as both average and spread, because applicants remember the longest wait, not the average.

What makes Lean Six Sigma succeed in services?

1. Leadership commitment: IHI stresses that a Lean culture starts at the top, with all staff involved. ^[2]
2. Leading at the front line: managers go to where the work is done and coach their teams rather than managing from reports alone.
3. Measure before and after: do not announce an improvement without a baseline and a test of whether the difference is significant. ^[6]
4. A process owner after the project: someone who tracks the indicators and updates the standard work.
5. Integration, not competition, between methods: Lean and other quality improvement models complement each other. ^[5]

Conclusion

Lean Six Sigma in services means seeing what is normally invisible: waiting, rework and unnecessary approvals. Start by mapping the process as it actually runs, measure before you change anything, choose the tool that fits the size of the problem, and do not close the project until you know who will sustain the gains.