In order for the Team to provide a Commitment they need some way of estimating the work effort of the Product Backlog Items. To help teams determine their commitment level Scrum employs a rather unique way of estimating through a technique known as ‘Planning Poker’. Basically it works like this:
1. Each Team member (except the Product Owner) is given a deck of Planning Poker cards (that carry a value of between 0 and 200).
2. The team reviews each product backlog item and decides which is the smallest / least complicated item and assigns it a value (e.g. 2-points). It really doesn’t matter what units you use (it could be popsicle sticks for all that matters) as the estimates are all relative to each other.
3. Then, starting from the top the Team selects the first item from the product backlog