This document discusses the objectives and activities of Work Package 4 in the ViBRANT project, which aims to ensure compatibility and access of data within ViBRANT through linking standards to flexible and controlled vocabularies. Some of the key activities mentioned are developing ontology tools to facilitate data exchange, enhancing existing services based on usage statistics, and linking the work to other packages within ViBRANT and external bioinformatics projects. Challenges include fusing different approaches to vocabularies and linking various technical tools.