Outcome
Issue a coordinated set
Coordination is still checked by eye.
Architectural, structural and services are drawn by different people, often in different offices, against a schedule that assumes somebody reconciled them. In practice that reconciliation is a senior person overlaying sheets by eye in the hours before issue, on the disciplines they thought to check.
CIM reads the whole set against itself - drawings against specifications, schedules against drawings, each discipline against the others - and returns the conflicts cited to the sheet and the page. A duct through a transfer beam, a door schedule that disagrees with the plan, a fire rating specified two ways.
You resolve them before the set leaves the office, at the cost of a redraw. The alternative price for the same finding is an RFI, a delay, and a conversation about who pays.
Before CIM
- Sheets overlaid by eye in the hours before issue.
- Whichever disciplines somebody thought to cross-check.
- The clash is found on site, by the trade installing it.
With CIM
- The full set read against itself on every issue.
- Conflicts returned cited to the sheet and the page.
- Resolved before issue, at the cost of a redraw.