In today’s projects, it’s essential to base decisions on data rather than intuition or experience. While personal judgment is important, relying solely on it can cause errors. Common pitfalls, like selective memory, overconfidence, and cognitive bias, can skew judgment. Modern projects also introduce new complexities that intuition alone may not be able to handle adequately. Combining data with experience leads to more accurate and effective decisions. In this Milestone, we will examine limits to experience-based decisions.