Explain and contrast processes improvement models such as Six$-$sigma, Lean, and PDCA to improve processes, create efficiencies and improve costs.

Consider the following process improvement models:

Six$-$Sigma

Lean

PDCA

For each process improvement model:

provide a description of it

explain how$/$when it is used

explain its benefits$$

compare and contrast it to the other models $($how is it similar? how is it different?$)$