Successful large-scale international survey projects often put lots of effort into the questionnaire design and development process. The Questionnaire Design and Documentation Tool QDDT is a web-based tool, developed to assist questionnaire development teams in their work. Focusing on the process of developing concepts and questions for topical questionnaire modules, the tools allows for reuse of items over time, keeping track of their development history, as well as publishing of content at various milestones. The questionnaire design process of the European Social Survey is the primary use-case for the tool. The conceptual model of the QDDT is based on the metadata standard DDI3.2, which facilitates reuse of items and interoperability with other tools.