BBS "focuses on what people do, analyzes why they do it, and then applies a research-supported intervention strategy to improve what people do".
At its very core BBS is based on a larger scientific field called organizational behavior management.
Behavior-based safety (BBS) is the "application of science of behavior change to real world safety problems". or "A process that creates a safety partnership between management and employees that continually focuses people's attentions and actions on theirs, and others, daily safety behavior."