Overproduction is regarded as the most serious waste as it discourages a smooth flow of goods or services and is likely to  inhibit  quality and productivity. Such overproduction also tends to lead to excessive lead and storage times. As a result defects may not be detected early, products may deteriorate and artificial pressures on work rate may be generated. In addition, overproduction leads to excessive work-in-progress stocks which result in the  physical dislocation of operations with consequent poorer communication. This state of affairs is often encouraged by bonus systems that encourage the push of unwanted goods. The pull or Kanban system was employed by Toyota as a way of overcoming this problem.

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