In Scrum, every Sprint (iteration) begins with a Sprint Planning Meeting. This meeting has one basic goal, creating a list of user stories which will be delivered in the next sprint. Of course, requirements may also be presented as features, scenarios, etc. I always use user stories, but these rules can also be applied to different types of requirements. Looking from my experience, it is the most difficult event to conduct in the whole Scrum Cycle. Product Owner and Development Team have to work togethe...