RTAS’14, the twentieth in a series of annual conferences sponsored by the IEEE, will be held in Berlin, Germany, as part of the Cyber-Physical Systems Week (CPSWeek) in April, 2014. CPS Week 2014 will bring together leading conferences, including the International Conference on Information Processing in Sensor Networks (IPSN’14), the International Conference on Hybrid Systems (HSCC’14), the International Conference on Cyber-Physical Systems (ICCPS’14), the International Conference on High Confidence Networked Systems (HiCoNS’14) and RTAS’14. The scope of RTAS 2014 will consist of three tracks: (1) Applications, Systems, RTOSs and Tools, (2) Applied Methodologies and Foundations, and (3) Hardware/Software Integration and Co-design. There will also be industrial and work-in-progress sessions.