A ‘bowtie’ is a diagram that visualizes the risk you are dealing with in just one, easy to understand the picture. The diagram is shaped like a bow-tie, creating a clear differentiation between proactive and reactive risk management. The power of a bowtie diagram is that it gives you an overview of multiple plausible scenarios, in a single picture.

In short, it provides a simple, visual explanation of a risk that would be much more difficult to explain otherwise.

The CCPS concept book provides guidance on this topic:

This topic relates to the following PSM elements:

Risk Assessment
Incident Investigation
Audits & Reviews
Workforce Involvement
Stakeholder Engagement