This document discusses how Lean principles remain relevant in Industry 4.0. It provides a brief history of Lean from Deming and Toyota in the 1980s to its integration with design thinking, startups, and emerging technologies. The document argues that Lean thinking focuses first on solving customer problems, while Industry 4.0 provides enabling technologies, and that the two concepts are integratable, not mutually exclusive. It provides an example of how Lean tools and Industry 4.0 could work together to improve maintenance reliability and predictability. The conclusion is that Lean is more relevant than ever when integrated along a maturity journey that puts people and problem-solving at the center.