In the Revit Project Browser > Views (BBA Groups) > 99 - BIM Manager Specific > Coordination (Clash)
Coordination Hard Beams Ducts Ceilings
Coordination Soft ADA Clearance
Walls
Ceilings
Doors
Windows
Stair and Railing
Roofs
Equipment 
Casework
Foundation
Foundation walls
Floor Slabs / decking
Column. Beams, and Framing
Gusset plates, braces, kickers and equipment supports
Miscellaneous metals such as elevator hoist beams, rails and rail support for the elevator
Ducts
Air handling equipment
Access zones
Piping
Electrical associated with HVAC
Electrical equipment
Access zones
Conduit
Lighting fixtures
Power feed to switchgear
Switches and outlets
Access zones
Plumbing and gas pipes
Plumbing equipment
Drainage pipes
Access zones
Ducts
Air handling equipment
Access zones
Piping
Electrical associated with HVAC
Hard Clash comprises of two components sharing the same place
When an element requires a buffer zone that is breached, it results in Soft Clash. This is often facilitated by the adding of a mass to families that represent service clearance and things like ADA clearances.