This document produces the first fundamental basis for the development of RESOLUTE’s methodology. It provides a comprehensive overview of concepts, notions and views on resilience, as well as other related aspects of systems theories and risk management. Resilience is a far reaching idea and has attracted the attention of a wide range of scientific domains. The definition of the concept varies somewhat according to literature domains but bears on a common need to address high complexity, variability and uncertainty that increasingly challenges current risk management practices. Literature often denotes that within many of such domains the term resilience has been used mainly as leverage to re-launch previously existing arguments and views, under a merely renewed terminology. Nevertheless, literature shows that significant advances have been made in risk management approaches, tools and assessment, even if not always grasping the full extent of their implications towards coping with complexity and fast pace changing operations. The domain of resilience engineering stands out by addressing resilience as an overarching concept, aiming to develop its theoretical foundations beyond its specific application to industrial sectors and risk domains. While empirical evidence clearly supports the foundations proposed by resilience engineering, specific metrics and methodologies remain sparse. Various proposals for resilience assessment were found, even if originating and focusing on specific domain needs, as opposed to an overall comprehensive assessment. This emphasises the need for research efforts on integrated and comprehensive tools to support the management of system resilience. A draft conceptual framework is proposed and will be used to support the continued work under work package 2. This work will mainly focus on further analysing the contents of this document, culminating with the development of thorough and applied guidance for RESOLUTE methodology. This will be the subject of Deliverable 2.2 (Synthesis and scoping for RESOLUTE) on month 8 of project development ...