A. The Development Team forecasts the most likely Product Backlog items to meet the business objective and create a Sprint Backlog based on a likely initial design and plan. Once the time- box for the Sprint Planning meeting is over, they start implementation and continue to analyze, decompose, and create additional functionality during the Sprint.

B. If all agree they can extend the Sprint Planning until the Development Team can forecast enough Product Backlog items before starting the implementation.

C. Allow the Development Team members as much time as needed to review the Product Backlog items and reconvene with the Product Owner when they are confident enough to make a forecast for the Sprint.

D. They discuss in the upcoming Sprint Retrospective why this happened and what changes will make it less likely to occur again.