Guidance materials developed by the European Commercial Aviation Safety Team (ECAST) explore the safety risk assessment portion of SMS. This document references the bowtie method and diagrams to clarify the use of safety terminology.

The UK Ministry of Defense and the UK Military Aviation Authority are jointly trialing the bowtie method. This site provides insight into their use of bowties along with sample bowtie products. 

As part of a large series of articles on Safety management tools, Skybrary provides an overview of the bowtie methodology. Additionally, the article includes links to related articles on Hazard Identification, Risk Assessment, and Risk Management.

A conference paper titled "Lessons Learned from Real World Application of the Bow-tie Method" by Steve Lewis and Kris Smith Risktec Solutions Inc. This paper provides insights into the practical application and benefits of utilizing bowties. 

A collection of robust bowtie examples developed by the UK Civil Aviation Authority. The example bowties include multiple scenarios for different types of aviation risks. 

The UK CAA provides detailed information on the bowtie method, how-to examples for new users, templates, and other valuable safety guidance materials.