Abstract
We report on the iterative process of a collaborative project to develop a standardised core metadata schema for learner corpora. Our report documents the last two years of concentrated work, which led to a new version of a metadata schema through the joint work of the four authors with systematic exchange and continuous involvement of the research community. We provide an overview of the steps taken in the creation process and report on difficulties and unsolved challenges. By doing so, we hope our experiences can serve as a blueprint for other communities that still face the challenge of standardising domain-specific metadata to make their data and metadata FAIR.