The Working Group “Metadata in Nanoindentation and Micromechanics” focuses on advancing the understanding of microstructure–property relationships in metals, ceramics, and polymers through small-scale mechanical testing. Techniques such as nanoindentation, microcompression, and in situ experiments (e.g., SEM/TEM-based) allow precise probing of elastic, plastic, and fracture behavior at the micro- and nanoscale. By integrating microstructural characterization—such as EBSD, TEM, or APT—with high-throughput mechanical testing, we aim to establish robust correlations between local structure and mechanical response. The group brings together experts working with diverse materials and instrumentation to develop standardized metadata protocols and analysis frameworks that ensure interoperability, reproducibility, and scalability. A particular focus lies in harmonizing data formats and workflows across techniques, enabling efficient data sharing and paving the way for advanced analytics and machine learning approaches in micromechanics.