During early coordination on a hospital project, the BIM manager runs a general clash detection between all models and generates over 3,000 clash…

In large-scale projects, running automated clash detection across all elements without scope filters yields thousands of irrelevant false positives, creating operational noise. A BIM Execution Plan (BEP) defines a clash matrix specifying precise tolerances, priority rules, and specific spatial zones for coordination. Applying the clash matrix enables the BIM manager to filter out minor geometric overlaps—such as minor duct-ceiling clearance issues or grid lines—and adjust hard and soft clash tolerances appropriately. By generating targeted reports filtered by discipline, zone, and trade scope, the BIM manager ensures that project teams receive actionable, prioritized clash data directly aligned with the project's predefined coordination strategy.

A. Distributing raw, unfiltered clash reports creates confusion, overwhelms trade contractors with minor false positives, and lacks clear prioritization aligned with project strategy.
B. Exporting thousands of unfiltered issues into a spreadsheet transfers manual sorting burdens to project managers without utilizing built-in BIM coordination filtering rules.
C. Temporarily relaxing or disabling rules across the board obscures legitimate high-priority clashes and risks missing critical constructability issues in essential building zones.

1. ISO 19650-2:2018 Section 5.6 "Production of information - Collaborative production of information and spatial coordination".

2. Autodesk Construction Cloud / Model Coordination Documentation: "Clash Detection

Clash Matrix

and Tolerance Settings". https://help.autodesk.com/view/COLLAB/ENU/

3. Penn State Computer Integrated Construction Research Program

"BIM Project Execution Planning Guide"

Version 2.2

Section 3.2 "Clash Detection and Coordination".