1. Constantly Improving Quality: Quality is a cornerstone of the Lean mindset. From offering a constantly improving level of service to current customers to finding ways to improve the quality of products before they even go to market, Lean focuses on improving quality across the entire process.

2. Eliminating Waste: Lean is all about identifying and eliminating waste in all its forms. This includes reducing inventory, overproduction, and excess motion. Lean also encourages eliminating process steps that do not add value.

3. Informing Everyone: Lean is all about empowering employees to make the best decisions with the correct information. This means everyone involved in the process must be informed of progress, tasks, and concerns so that they can make the best decision.

4. Fostering Continuous Improvement: No process is ever perfect and Lean promotes continuous improvement that is driven by data. This encourages teams to continually strive for excellence and find better ways of doing things.