Building Information Modelling had, by the mid-2010s, become a mandated requirement for UK government projects — but the conversation remained largely anchored at ‘Level 2 BIM’, structured around file-based collaboration and discipline-specific models federated at key design stages. The next step — genuinely integrated, cloud-native, real-time collaboration — remained more aspiration than practice.
C4C: Clouds 4 Communication was a research and development project exploring what that next step might look like. Its central contribution was the concept of ‘confidence’ within digital construction design: a way of expressing, tracking, and communicating how reliable any given piece of design information actually was — and therefore how much weight other disciplines and the client could place upon it.
The confidence problem in BIM
In a federated BIM environment, teams share models — but the status of information within those models is often unclear. Has a wall been designed, or is it still indicative? Has a structural member been sized, or is it a placeholder? The lack of a structured way to express information reliability created coordination risk, because teams acted on information that wasn’t yet reliable enough to act on.
C4C proposed that every element within a shared model should carry a ‘confidence’ attribute — a structured, agreed signal of information maturity — allowing other disciplines and the client to make better decisions about when and how to act on shared data.
What we did
- Developed the theoretical and practical framework for ‘confidence’ as a BIM information attribute, mapped against design stages and decision points,
- Explored cloud-native collaboration architectures that could support real-time multi-disciplinary access to a common data environment,
- Tested the confidence framework with design team participants, examining how it changed coordination behaviour and decision-making,
- Produced research findings and guidance for the integration of confidence-based information management into BIM workflows and standards.
Knowing what you don’t know yet — and being able to tell your collaborators — turns out to be as important as the information itself.
Legacy and relevance
The questions C4C raised about information reliability, shared data environments, and the architecture of trust within digital collaboration have only grown in importance as the industry has moved toward genuine cloud-native working. The confidence concept anticipated debates that are now central to the development of the UK’s golden thread of information, the Building Safety Act digital requirements, and the evolution of ISO 19650.