This thematic group brings together researchers concerned with Foundational Conceptual Issues in the development & capability theory and literature. We aim to provide a platform to support and promote foundational research within the HDCA community about important concepts in the Capability Approach such as agency, freedom, evaluation, justice, and well-being. The group will have an email list for sharing questions, comments, working papers, bibliographic references, and announcements of relevant events such as conferences. Activities: We will organise panel sessions at future HDCA conferences. An international workshop between the annual HDCA conferences is also being considered.