Method arguments usually become confusing when teams compare tools that were built for different jobs. Bowtie, JSA, and What-If analysis are all useful, but they answer different questions.
Use JSA for specific work preparation
JSA works best when the team is preparing a concrete task. It helps break the job into steps, identify hazards, define controls, and confirm readiness before work starts. That makes it especially useful around permit-controlled work, contractor jobs, maintenance tasks, and non-routine field execution.
Use what-if analysis to explore scenarios
What-If analysis is stronger when the team needs to explore broader operating conditions and possible failure scenarios. It is useful when there is uncertainty about how a process, system, asset, or change could behave under different conditions. It is more exploratory than a task-level method and can reveal combinations that a narrow checklist would miss.
Use Bowtie to understand barriers
Bowtie is most useful when the organization needs to understand threats, top events, consequences, preventive barriers, and recovery barriers around significant exposure. It helps visualize how control should work and where barrier failure creates escalation. That makes it valuable for major hazards, high-consequence process risks, and situations where the site needs a shared picture of the control logic.
Do not force one method to do everything
The common mistake is to force one method to cover every need. JSA becomes too narrow when the issue is systemic. Bowtie becomes too heavy when the question is simply whether a team is ready to perform one task safely. What-If analysis becomes too loose when the operation needs a controlled job-level decision. Good practice is to use each method where it adds the most clarity.
The Vinkey view
In Vinkey's view, method choice should follow the operational decision. JSA belongs close to work execution, What-If analysis helps explore wider scenarios, and bowtie helps explain barrier logic around significant exposure. Together they strengthen hazard understanding when each is used in the right place.