Our Stories

A collection of our Blogs, Articles, and Whitepapers

FSA Stages - What They Are and Why We Do Them

A Functional Safety Assessment (FSA) is defined by the IEC 61511 standard as an “investigation, based on evidence, to judge the...

Don’t Dismiss Stage 4 of an SIS Functional Safety Assessment!

The 2nd edition of IEC 61511 now requires – by use of the word “shall” – that a Stage 4 Functional Safety Assessment (FSA) be conducted...

Does Your Facility Have the Flu? Use Bayes Rule to Treat the Problem Instead of the Symptom

Is our industry addressing the problems facing it today? We idealize infinitesimally small event rates for highly catastrophic hazards,...

Lessons Learned on SIL Verification and SIS Conceptual Design

by Richard E. Hanner & Ravneet Singh There are many critical activities and decisions that take place prior to and during the Safety...

The use of Bayesian Networks in Functional Safety

Functional safety engineers follow the ISA/IEC 61511 standard & perform calculations based on random hardware failures. These result in...