National Annex Guidance. As part of a national level adoption of BIM the technical framework for BIM delivery needs to be considered. In most cases the adoption of the International standard, ISO 19650 is a key part of the national technical framework for BIM. As part of the process of adopting an ISO standard at the national level an annex to the standard should be considered. The National annex addition to the standard gives additional, country specific detail and context. This can also include the localisation of terminology used where this differes to the ISO terms. This guidance document has been specifically created to support the creation of a national annex aligned to ISO 19650. The guidance documents the areas of the standard which can have additional country specific context applied and some suggestions for these sections.