Kaizen tries to improve business as a whole by creating a standard way of working, increasing efficiency and eliminating business waste. Six sigma is more focussed on quality output.
Lean is all about eliminating waste to increase process speed and quality through the reduction of process waste.
KAIZEN is the sino Japanese word for “improvement”. In business “kaizen” refers to activities that continuously improve all functions and involve all employees (from CEO to assembly line workers). By improving standardized programmes and processes, Kaizen aims to eliminate waste.