Operations · business glossary
What is Lean?
By Shivam Bhandari · Reviewed 31 October 2026 · How we write
definition
An operating philosophy focused on systematically removing any step in a process that doesn't add value the customer would pay for.
Lean explained
Lean is a management approach, developed from the Toyota Production System, focused on removing waste and continuously improving processes.
example
A clinic maps a patient's visit, finds 20 minutes of waiting between steps, and rearranges staff to cut it.
why it matters
It improves speed, quality and cost at the same time.
common mistake
Treating lean as cost-cutting rather than involving staff in improving their own work.
Frequently asked questions
What is Lean?
An operating philosophy focused on systematically removing any step in a process that doesn't add value the customer would pay for. Lean is a management approach, developed from the Toyota Production System, focused on removing waste and continuously improving processes.
Why does Lean matter?
It improves speed, quality and cost at the same time.
What is a common mistake with Lean?
Treating lean as cost-cutting rather than involving staff in improving their own work.
Related terms
Just-in-time (JIT)
Receiving inventory only as close as possible to when it's actually needed, minimising cash tied up in stored stock.
Six Sigma
A structured methodology for reducing errors and variation in a process to a very small, statistically defined tolerance.
Bottleneck
The single slowest step in a process that limits how much the entire process can output, regardless of how fast other steps run.