First, Ask Why
Understanding The Reason Behind A Project Helps You Prioritize Its Value
I used to have a line on my CV about delivering scope on time and within budget. I was very proud that I'd rigorously defended my projects against scope creep. But I was missing the point. The real reason organizations undertake projects is to achieve value. The agile movement intrinsically understands this, its core principles acknowledge that requirements will change as understanding grows. But even classic agile tools and concepts, like the burn up (or burn down) chart and the cone of uncertainty, are often scope-oriented.