This document describes best practices for use case projects in terms of projects, templates and plans, with the objective to improve the consistency of content across different use case projects and enable sharing of knowledge between projects. A long-term goal is to foster interoperability between tools supporting the collection and maintenance of use cases. This document is intended for developers of use case projects, including in the context of standardization. The document can be used to complement existing methodology standards such as IEC 62559.