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This book is Open Access under a CC BY licence.

The LNCS 11427 and 11428 proceedings set constitutes the proceedings of the 25th International Conference on Tools and Algorithms for the Construction and Analysis of Systems, TACAS 2019, which took place in Prague, Czech Republic, in April 2019, held as part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2019.

The total of 42 full and 8 short tool demo papers presented in these volumes was carefully reviewed and selected from 164 submissions. The papers are organized in topical sections as follows:

Part I: SAT and SMT, SAT solving and theorem proving; verification and analysis; model checking; tool demo; and machine learning.

Part II: concurrent and distributed systems; monitoring and runtime verification; hybrid and stochastic systems; synthesis; symbolic verification; and safety and fault-tolerant systems.

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Concurrent and Distributed Systems.- Checking Deadlock-Freedom of Parametric Component-Based Systems.- The mCRL2 Toolset for Analysing Concurrent Systems: Improvements in Expressivity and Usability.- Automatic Analysis of Consistency Properties of Distributed Transaction Systems in Maude.- Multi-Core On-The-Fly Saturation.- Monitoring and Runtime Verification.- Specification and Efficient Monitoring Beyond STL.- VyPR2: A Framework for Runtime Verification of Python Web Services.- Constraint-based Monitoring of Hyperproperties.- Hybrid and Stochastic Systems.- Tail Probabilities for Runtimes of Randomized Programs: Martingale Synthesis for Higher Moments.- Computing the Expected Execution Time of Probabilistic Workflow Nets.- Shepherding Hordes of Markov Chains.- Optimal Time-Bounded Reachability Analysis for Concurrent Systems.- Synthesis.- Minimal-Time Synthesis for Parametric Timed Automata.- Environmentally-friendly GR(1) Synthesis.- StocHy: automated verification and synthesis of stochastic processes.- Synthesis of Symbolic Controllers: A Parallelized and Sparsity-Aware Approach.- Symbolic Verification.- iRank: a variable order metric for DEDS subject to linear invariants.- Binary Decision Diagrams with Edge-Specified Reductions.- Effective Entailment Checking for Separation Logic with Inductive Definitions.- Safety and Fault-Tolerant Systems.- Digital Bifurcation Analysis of TCP Dynamics.- Verifying Safety of Synchronous Fault-Tolerant Algorithms by Bounded Model Checking.- Measuring Masking Fault-Tolerance.- PhASAR: An Inter-Procedural Static Analysis Framework for C/C++.

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