This document specifies a methodology, with general requirements and criteria, for the development of the data templates for the declaration of performance and conformity (DoPC) of construction products. NOTE This document integrates a data template structure from EN ISO 23387:2025 [4] to be used for DoPC of construction products, together with a methodology for experts to develop domain specific data templates, following EN ISO 23386:2020 [3] and the standards from CEN/CLC/JTC 24. Annex A provides guidance for the development of data templates for harmonized technical specifications (hTS) and European assessment documents (EAD), for product technical committees (TCs) and other stakeholders.