On March 31, 2021, the third Coffee Lecture of our series took place with the title "Der Datenmanagementplan: früh geplant, ist halb gewonnen". We would like to thank the numerous participants again! The event gave an overview of what a data management plan is, which methods and tools facilitate the creation and how this is increasingly the condition for project funding by third-party funding providers. The approximately 20-minute presentation is now online on YouTube. The slides of the presentation are available in German on Zenodo.