Amazon has been able to create a more customer-centric approach by concentrating solely on items that are directly relevant to its customers' needs. So, when it comes to choosing a mode of transportation for a cargo, the promised delivery date to the client is the most important factor. Calculation of on-time delivery must be based on the odds of lower-cost choices being as likely to deliver as the high-cost ones. Here's an example of how the Lean Principle is applied. As evidence of this managerial approach to lean management, Amazon's fulfillment and customer service centers employ more people than its computer science departments. Providing the necessary customer service via phone, chat, and e-mail, as well as receiving, storing, choosing, packing, and shipping products, required the full participation of the Gemba (the frontline physical location of "value labor")