Six Sigma — Six Sigma is a data-driven methodology focused on reducing defects and variation in processes.

In plain English

Six Sigma is about making processes predictable by reducing variation.

Less guessing.
More data.
Fewer surprises.

What they actually mean

Six Sigma works best where problems are measurable.

It struggles where problems are cultural, political, or vague — even though people still try to use it there.

Used well, it brings clarity.
Used everywhere, it becomes bureaucracy.

Example

Does it actually matter?

✅ Yes — when defects are costly and repeatable.