Human functions in safety - developing a framework of goals, human functions and safety relevant activities for railway socio-technical systems

• Defines concepts describing how people contribute to safe/effective rail operations. Provides a framework for designers/safety experts understand human functions. Applies the setting identify safety-relevant Presents potential application new technical challenges and other domains. This paper presents express role of in establishing maintaining system safety. The Human Functions Safety (HFiS) has been developed railway context, safety-related activity within functions, this is shaped by overall organisational goals contextual factors. Analysing functions way moves from reactive, accident-analytical approach that commonly used rail, instead emphasising maintains development first HFiS involved three iterative stages 1) mapping requirements safety literature determine framework; 2) collating synthesising data domain content 3) review research team with subject matter experts. output applying railways detailed description 66 carried out wide-ranging frontline staff, associated activities maintain covered different types (systemic, functional individual) shape work specified factors influence Interrelations between across are also identified. As well as supporting understanding safety, demonstrates can be combined potentially applied large socio-technical systems. Specific guidance presented on generic applications concepts, including set inform