Resilience engineering has consistently argued that safety is more than the absence of failures Since the first book was published in 2006 several book chapters & papers have demonstrated the advantage in going behind 'human error' & beyond the failure concept just as a number of serious accidents have accentuated the need for it But there has not yet been a comprehensive method for doing so; the Functional Resonance Analysis Method (FRAM) fulfils that need Whereas commonly used methods explain events by interpreting them in terms of an already existing model the FRAM is used to model the functions that are needed for everyday performance to succeed This model can then be used to explain specific events by showing how functions can be coupled & how the variability of everyday performance sometimes may lead to unexpected & out-of-scale outcomes
- either good or bad The FRAM is based on four principles equivalence of failures & successes approximate adjustments emergence & functional resonance As the FRAM is a method rather than a model it makes no assumptions about how the system under investigation is structured or organised nor about possible causes & cause-effect relations Instead of looking for failures & malfunctions the FRAM explains outcomes in terms of how functions become coupled & how everyday performance variability may resonate This book presents a detailed & tested method that can be used to model how complex & dynamic socio-technical systems work to understand why things sometimes go wrong but also why they normally succeed