Use cases, user stories, or backlog items already define broadly the scope of a project. Many teams consider requirements as something provided by the business users, product owners or customers. Asking business users to provide the scope is effectively relying on someone who has no experience designing software solutions to give us a high level solution design. This article explains how project teams can work together with business users to come up with the right scope. To reach this goal, you need to start with business goals, and not with user stories, and derive the scope from that.
Building the Right Scope