This book constitutes the proceedings of the 23rd Ada-Europe International Conference on Reliable Software Technologies, Ada-Europe 2018, held in Lisbon, Portugal, in June 2018. The 10 papers presented in this volume were carefully reviewed and selected from 27 submissions.

Safety and Security.- Using Safety Contracts to Verify Design Assumptions During Runtime.- Tool-Supported Safety-Relevant Component Reuse: From Specification to Argumentation.- Ada 202X.- Safe Dynamic Memory Management in Ada and SPARK.- Safe Non-Blocking Synchronization in Ada2x.- Handling Implicit Overhead.- On the Effect of Protected Entry Servicing Policies on the Response Time of Ada Tasks.- Improved Cache-Related Preemption Delay Estimation for Fixed Preemption Point Scheduling.- Real-Time Scheduling.- Combined Scheduling of Time-Triggered and Priority-Based Task Sets in Ravenscar.- Theory and Practice of EDF Scheduling in Distributed Real-Time Systems.- New Application Domains.- Safe Parallelism: Compiler Analysis Techniques for Ada and OpenMP.- Microservice-based Agile Architectures: an Opportunity for Specialized Niche Technologies.

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