This is a collection of papers from the Symposium on Formal Techniques in Real-Time and Fault-Tolerant Systems held at the University of Warwick on 22-23 September 1988. The papers cover a variety of subjects in these areas and illustrate different approaches to modeling safety critical systems. Important notions of time, synchrony, redundancy and replication are examined using assertional reasoning, temporal logic and the logics of knowledge. The volume will be invaluable to researchers in formal modeling of concurrency, real-time and fault-tolerance, and to software engineers in safety-critical applications.