Introduction:
Lean manufacturing: Lean manufacturing is a systematic approach of identifying and eliminating waste through continuous improvement, flowing the product at the pull of the customer in pursuit of perfection. Lean manufacturing is a comprehensive approach to eliminating waste from your operation. It is a systematic methodology that uses various tools to achieve the goal of reduced waste. The principle of lean manufacturing is to reduce cost through continuous improvement that will eventually reduce the cost of services and products, thus growing more profits.

Waste: Waste can be defined as a substance or a thing that is no longer useful in a process. Waste is in fact anything that adds cost, but not value to a product. Toyota executive Taiichi Ohno identified seven types of wastes in manufacturing system, namely:
Overproduction- It is considered to be the worst of the wastes, as it multiplies the other 6 wastes and hides your true capability, thereby causing you to make bad decisions such as turn work away or invest in unnecessary additional capacity.
Defects- It is also pure waste as poor quality is produced. Time, energy and materials are consumed needlessly, and even if the customer is not lost, you still need to do the work again.
Inventory- It is the worst of all the 7 wastes. It ties up cash, requires labor, energy and fixed assets to manage it, and moreover it provides a false sense of comfort by hiding problems.
Motion- In terms of ease of elimination and size of improvement impact, the waste of motion ranks very high and is often the target of kaizen.
Process- It means that a process is not necessary or uses more resources then the customers need require.
Transportation- It is quite visible and clearly adds no value, yet by itself not such a huge waste. This waste can shoot up the priority list whenever it increases the