by Richard McPartland
PAS 1192-2:2013 Specification for Information Management for the Capital/Delivery Phase of Construction Projects using Building Information Modelling sets out requirements for project delivery when delivering projects to BIM Level 2.
It defines the Project Information Model (PIM) as:
The information model developed during the design and construction phase of a project.
How does the PIM evolve during the project lifecycle?
The Project Information Model is progressively developed across the project lifecycle - it begins as a 'design intent' model and develops to become a virtual construction model. This virtual construction model is transferred to the construction suppliers who will handover the model to employers on completion.
In the early stages the PIM is likely to feature a number of generic elements represented via symbols or simple massing diagrams. More critical elements of a project are likely to be worked up in more detail, even at an early stage, to inform decision making.
As the project progresses the level of detail will increase throughout and extraneous information may also be removed.
What governs the development of the PIM?
The Project Information Model is developed in accordance with the Master Information Delivery Plan (MIDP).
The PIM's information deliverables will be delivered to the employer through a series of information exchanges or data drops. These drops effectively act as staging posts for the project and are overseen by the information manager.
The stages should align to the employers' decision making processes as defined by the Employer's Information Requirements and any supplementary BIM Protocol. These exchanges are codified in documents like the CIC Scope of Services.
What validation takes place as data is exchanged?
It is important that the processes, procedures and responsibilities are established to validate the data received at each of the stage gateways with attention paid to accuracy, compliance with standards, integrity, continuity and completeness. These requirements should be set out in the Employer's Information Requirements (EIR) along with validation procedures for the Common Data Environment (CDE), the shared digital repository for the entire project team.
What is contained in the PIM?
When working to BIM Level 2, the Project Information Model is likely to consist of a federated building information model and a variety of non-graphical data and documentation. Typically the PIM will contain a range of domain-based models and will be partly populated using data sourced from the client’s information model (which exists as a separate entity).
Obviously, capturing and developing information effectively from the start will ensure that design, regulatory, construction, and supply teams are able to collaborate efficiently, making use of well-structured and integrated information.
What happens to the PIM at completion?
At completion, elements of the PIM are transferred into the Asset Information Model (AIM) in line with Employer's Information Requirements.
PAS 1192:3 specifies how information from the Project Information Model (PIM) is transferred to the Asset Information Model (AIM) or how the AIM is created for an existing asset.
What to read next...
What is the Asset Information Model (AIM)?
Our guide to the Asset Information Model or AIM, what it's used for, and by whom, and when across the lifecycle of a digital construction project.
What is the Common Data Environment (CDE)?
What is the common data environment or CDE on a construction project used for? Who contributes? Who is responsible? Who owns the information within? Why use a CDE at all? We explore the idea of a central information repository that is at the heart of BIM implementation.