Seyed Shamseddin Alizadeh - Department of Occupational Health Engineering, Health Faculty, Tabriz University of Medical Sciences, Tabriz, IRAN
Parisa Moshashaei - Department of Occupational Health Engineering, Health Faculty, Tabriz University of Medical Sciences, Tabriz, IRAN

The Bowtie method is a qualitative incorporating management system technique. The theory behind the bow tie approach can be found in the “Swiss cheese model” of Reason. The Royal Dutch/Shell Group was the first major company to integrate fully the total bow-tie methodology into its business practices and then the bowtie has become popular as a structured method to assess risk where a quantitative approach is not possible or desirable. Its essence is to establish how many safety barriers there are available to prevent, control or mitigate the identified scenarios, and the quality of those barriers.The Bowtie method is a qualitative incorporating management system technique. The theory behind the bow tie approach can be found in the “Swiss cheese model” of Reason. The Royal Dutch/Shell Group was the first major company to integrate fully the total bow-tie methodology into its business practices and then the bowtie has become popular as a structured method to assess risk where a quantitative approach is not possible or desirable. Its essence is to establish how many safety barriers there are available to prevent, control or mitigate the identified scenarios, and the quality of those barriers.

Bowtie method, safety management system, Swiss cheese model, business