Prioritising Complex Requirements

• Scrum/OpenUp manage requirements in a prioritised "product backlog" stack of work items
• Work items can be functional or nonfunctional requirements, defects or nonrequirements work e.g. reviewing, training, configuring
• At the beginning of each iteration a suitable amount of items are pulled off the top of the stack
• Work items can be prioritised at any time highlighting not only the most complex and valuable items but recording their relationships and dependencies

See: Complex Requirements On an Agile Project