Architecting critical systems has gained major importance in commercial, g- ernmentalandindustrialsectors. Emergingsoftwareapplicationsencompasscr- icalities that are associated with either the whole system or some of its com- nents. Therefore, e?ective methods, techniques, and tools for constructing, te- ing, analyzing, and evaluating the architectures for critical systems are of major importance. Furthermore, these methods, techniques and tools must address - sues of dependability and security, while focusing not only on the development, but also on the deployment and evolution of the architecture. This newly established ISARCS symposium provided an exclusive forum for exchanging views on the theory and practice for architecting critical systems. Such systems are characterized by the perceived severity of consequences that faults or attacks may cause, and architecting them requires appropriate means to assure that they will ful?ll their speci?ed services in a dependable and secure manner. The di?erent attributes of dependability and security cannot be considered in isolation for today critical systems, as architecting critical systems ess- tially means to ?nd the right trade-o? among these attributes and the various other requirements imposed on the system. This symposium therefore brought together the four communities working on dependability, safety, security and testing/analysis, each addressing to some extent the architecting of critical s- tems from their speci?c perspective. To this end the symposium united the following three former events: – Workshop on Architecting Dependable Systems (WADS) – Workshop on the Role of Software Architecture for Testing and Analysis (ROSATEA) – Workshop on Views on Designing Complex Architectures.