As a Team Member, it is my job to figure out how to solve a problem or request that is stated by a Product Backlog Item (PBI), with the help of my team.  It is the responsibility of the Product Owner to give us the vision of the product and decide how much scope is to be done to satisfy the PBI.  One simple way to think about this concept is that the Product Owner is responsible for the “what” and “why” and the Scrum Team is responsible for the “how” and “who”.  If the Team Members decide on the product vision by themselves, they run the risk of misinterpreting features, moving down a path that is not valuable or even creating work disconnected from the needs of those who will be using the software.  If the Team Members choose their own scope they may do much less than is needed or much more than is required.  There is a balance in the Product Owner providing vision and scope, and the Scrum Team providing knowledge and experience in its execution.