During a requirement gathering workshop we would typically cover how we unearth, explore and challenge the businesses preconceptions to ultimately help define the requirements based on business value, customer needs and technical reality.
The product backlog is, at its most simple, a prioritised features list, containing user stories and test scenarios for required required functionality:
User stories – examples
As an administrator I want to be able to approve access to the member's section of the site
As the system I want to automatically update a directory of members from an MS Access database
As a user I want to search the directory of members
As the developer I want to migrate the content from the existing Joomla site to Drupal
As the administrator I want to upload documents to a library with a folder structure