Walk through each story handled by the team and look for possible improvements Source:
Preparation: Collect all stories handled during the iteration and bring them along to the retrospective. In a group (10 people max.) read out each story. For each one discuss whether it went well or not. If it went well, capture why. If not discuss what you could do differently in the future. Variants: You can use this for support tickets, bugs or any combination of work done by the team.
Hand out sticky notes and markers. Write the big problem you want to solve onto a note and stick it to the top of a wall or big board. Ask the participants to write down ideas of what they can do to solve the problem. Post them one level below the original problem. Repeat this for each note on the new level. For every idea ask whether it can be done in a single iteration and if everyone understands what they need to do. If the answer is no, break it down and create another level in the problem solving tree.
Once you have lower levels that are well understood and easy to implement in a single iteration, dot vote to decide which to tackle in the next iteration.
Prepare 3 flip chart papers titled 'Helped', 'Hindered', and 'Hypothesis' (suggestions for things to try out). Ask participants to help you grow and improve as a facilitator by writing you sticky notes and signing their initials so that you may ask questions later.