What is the focus of Lean Thinking?

Reducing delays is the focus of Lean thinking. Lean thinking is a philosophy and a set of principles and practices that aim to eliminate waste and optimize value delivery. Waste is anything that does not directly contribute to customer value or that causes delays in delivering value. Delays are the primary cause of waste, as they increase inventory, risk, variability, overhead, and dissatisfaction. Reducing delays means minimizing the time between customer need and value delivery, which improves quality, efficiency, and customer satisfaction. References: Thriving in the Digital Age, SAFe Principle #2