Lean is achieving “More with LESS”. It means achieving more with given resources or achieving more with less resources .Mainly it is elimination or reduction of waste .
Lean manufacturing system can be understood by relating to the human body. If the person is lean means general understanding is that he/she is free from unnecessary FAT in the body, hence free from unnecessary side effects like BP, Pain in joints, laziness etc. And the person is perceived as healthy, more flexible, active etc.. The same way if the Lean manufacturing means , manufacturing system is free from unnecessary fats like high inventory, high rejection, high breakdowns or line stoppages factors etc which leads to more flexible in delivery, less lead time ,First time right , low cost of manufacturing and free flow of communication etc .
Similarly, Lean System or Lean Organisation means free from unnecessary waste in the entire value chain starting from extended supply chain system to customer, even after sales service system .
Lean system Thinking is more than application of Tools and Techniques. It is a culture or a way of working or mindset of everyone working for the organization.