Most teams don't decide to invest in process training because everything is calm. They decide because one of these five patterns has been quietly repeating for long enough to notice.
1. The same fire gets put out every quarter
If your team has a recurring incident — a shipping delay, a billing error, a recurring outage — and the fix each time is "we caught it faster this time," that's a symptom being treated, not a root cause being removed. That's precisely the gap DMAIC's Analyze phase is built to close.
2. Fixes depend on one person's tribal knowledge
When a process only works because one specific person remembers the workaround, you don't have a process — you have a single point of failure with a job title. Process mapping (a Yellow Belt-level skill) makes that hidden knowledge visible and transferable.
3. Handoffs are where things go wrong
Individually, each team does their part well. But work keeps stalling or breaking at the boundary — between sales and fulfillment, between intake and triage, between engineering and support. Handoff failures are one of the most common findings in a first Green Belt project, because no single team owns the problem end-to-end.
4. Decisions run on opinion, not data
"I think it's the vendor" and "I think it's the new system" can both be confidently argued in the same meeting, with no data to settle it. That's a sign the team is missing the Measure discipline that Six Sigma brings — a way to make the process show you what's actually happening instead of what people assume.
5. Improvements don't stick
Maybe the team has tried to fix this before. It got better for a few weeks, then quietly drifted back. That's almost always a missing Control phase — no one built a way to notice, and correct, when the process starts sliding back to the old behavior.
If two or more of these sound familiar, a Green Belt project is usually enough to prove the method works before you invest in training a wider team.
What to do next
You don't need to commit an entire department to certification to test this. Start with one Green Belt on the process that hurts the most, let them run a real capstone project against it, and use that outcome to decide how far to take it from there.