In the UK, the Government Construction Strategy published in May 2011, stated that the '...Government will require fully collaborative 3D BIM (with all project and asset information, documentation and data being electronic) as a minimum by 2016'. This represents a minimum requirement for Level 2 BIM on centrally-procured public projects, that is, building information will be managed in a 3D environment with data attached, but may be created in separate models.
'Manageable spatial subdivision of a project, defined by the “project team” as a subdivision of the overall project that allows more than one person to work on the project models simultaneously and consistent with the analysis and design process.'
Each volume is represented by a separate reference file, but when viewed together the full or partial project can be represented.
PAS 1192-2 suggests that this is analogous to the subdivision of a project into volumes by the lead designer in order that different disciplines can develop system models (such as; walls, cores, cladding, HVAC systems, structure, pipework, ductwork, electrical systems and so on). This subdivision can also allow individual files to be kept to a manageable size.
BIM volumes should be agreed and published at the beginning of the project, and this should be reviewed and revised as required as the project progresses.
 Related articles on Designing Buildings Wiki
- BIM execution plan.
- CIC BIM Protocol.
- Construction Operations Building Information Exchange (COBie).
- Collaborative practices.
- Employer's Information Requirements.
- Federated building information model.
- Government Construction Strategy.
- Information manager.
- PAS 1192-2.
- Standard method and procedure.
- Thermal zones in building design.
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