Catalogues help administrations find reusable resources (e.g. services, data, software, data models). Various types of catalogues exist, e.g. directories of services, libraries of software components, open data portals, registries of base registries, metadata catalogues, catalogues of standards, specifications and guidelines.

CAMSS provides a comprehensive method to assist the assessment of ICT standards and specifications. CAMSS provides a method, it does not itself select standards. The CAMSS method aims to achieve interoperability and avoiding vendor lock-ins. CAMSS criteria evaluate (among other things) the openness of standards and specifications.

The CPSV-AP is a data model that describes public services in a structured and machine-readable way by standardising the semantics. Public administrations and service providers can use this approach to guarantee a level of cross-domain and cross-border interoperability at European, national and local level.

Core Vocabularies are simplified, re-usable and extensible data models that capture the fundamental characteristics of an entity in a context-neutral fashion.