Probably one of the most important parts of scrum would be retrospective. It’s the time to look back what the team (and its members) accomplished during the sprint, what went good and what went bad.
It seems that the for L’s method is the most effective way to get real and emotional feedback that not only reflects the bad parts but also emphasize the good parts of the sprint. The team focuses to answer the following four questions:
Answers for the lacked and learned should be turned into action items and the scrum master should focus on removing the impediments.
The implementation is simple, just create a spreadsheet and fill it together with the team.Each item that is added to a column should be debated. At the end, the sheet should be shared. Or even better, it can be printed out and put on a dashboard, together with the action items for the retrospective.