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BIM Questions & AnswersNovember 2014

Dr Sarah Birchall, Sustainability Engineer, BSRIA

Q1. What is the BEP and how does it relate to your EIR?

It is probably easier to think about the EIR first. The EIR (Employer’s Information Requirements) is a pretender document prepared by the Employer, which sets out the information to be delivered and the standards or processes to be adopted by the supplier as part of the project delivery process.

The BEP (BIM Execution Plan) is produced by the supply chain as a response to the EIR, detailing how its requirements will be met.

In accordance with PAS 1192-2:2013, the BEP should cover a number of aspects such as resourcing, capabilities and IT tools and processes.

Q2. What is COBie and when do I deliver COBie data?

COBie (Construction Operations Building information exchange) is a data standard to manage the data coming from BIM models into the client organisation. It was developed by the US Corps of Engineering. COBie data is delivered, via spreadsheet exchange, along with existing contract deliverables, at key stages during the life of an asset to help inform owner or operator decision making.

Q3. What is clash detection?

There are many models in BIM. A model is created by each discipline (MEP, architectural, structural etc.) independently and it is important to know if there are any “clashes” in the design, for example if parts of the structure clash with the M&E equipment. In the past clash detection would take place during the construction phase, when clashes would need fixings on-site, causing added expense and delays.

With BIM, at the design stage the individual discipline models are combined into a federated model using specific software. This software carries out clash detection, based on a series of rules, and highlights potential issues. This means that constructability issues can be resolved before construction begins, saving both cost and time.

Q4. How is the BIM model provided by the supply chain at handover used in operation?

On completion of the new construction project, the project information model (PIM) is passed to the client, together with all the relevant handover information.

Adapted from Figure 10 from PAS 1192-3:2-14 © BSI

The PIM, which stores the as-built geometric, non-geometric and other project information, relating to as-constructed, has to be checked, reviewed and approved (at ‘approved gate 6’ on the diagram on the right) before it can enter the ‘Shared Area.’ Further checks, including co-ordination, clash and file checking is completed before being transferred to the Client Shared Area.

The owner or operator must then verify, validate and authorise (at ‘authorised gate 7’) the contents including content checks against the AIR (asset information requirements), which forms part of the EIR, and completion of the plain language questions (where applicable). The approved data is then transferred to the Published area.

The Published area should be maintained in two parts: a File Store to hold all the Published Level 2 files (documents, geographic models and non-geographic structured data files), and a Data Store to hold all nongeographic structured data as a data model.

The Published area of the CDE should only hold current published information. Any superseded information should be moved into the Archive area.

The verified information in the Published area can be linked with enterprise systems such as Enterprise Reporting System, Information Technology Management Systems, Asset Utilization Systems, Supervisory Control & Data Acquisition Systems and Financial Systems.

PAS 1192-3 focuses on the operational phase of assets. It is a companion document to PAS1192-2, which specified an information management process to support BIM Level2 in the capital/delivery phase. Both can be downloaded from the BSI website.

The diagram above is based on Figure 10 in PAS 1192-3:2014. For continuity, the gate numbers here have been left as they appear in the original source figures.

For further information about BIM and more FAQs please visit the BIM Task Group

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