Daryl Kulak explains that if we don't ask the right question at the beginning of the project, then no matter how well we answer, it won't be helpful. Perhaps the biggest difference between agile and waterfall is the question being asked. The scope of the project and any judgments of progress are related to this very fundamental question.
When Mary Gorman and Ellen Gottesdiener facilitated a game called The Backlog Is in the Eye of the Beholder for the Boston chapter of the International Institute of Business Analysis, both the players and the facilitators learned some important lessons in organizing a project requirements backlog. In this article, they describe the game and what it revealed, including the value of truly knowing your stakeholders.