This bookconstitutes the refereed proceedings of the 12th International Conference on IntegratedFormal Methods, IFM 2016, held in Reykjavik, Iceland, in June 2016.The 33 paperspresented in this volume were carefully reviewed and selected from 99submissions. They were organized in topical sections named: invitedcontributions;

Invited Contributions.- Can Formal Methods Improve the Efficiency of Code Reviews.-Symbolic Computation and Automated Reasoning for Program Analysis.- Program verification.- On Type Checking Delta-Oriented Product Lines.- Verifying a priority scheduler for an SCJ runtime environment.- Why Just Boogie? Translating Between Intermediate Verification Languages.- Probabilistic systems.- Statistical Approximation of Optimal Schedulers for Probabilistic Timed Automata.- Probabilistic Formal Analysis of App Usage to Inform Redesign.- Extension of PRISM by Synthesis of Optimal Timeouts in Fixed-Delay CTMC.- Concurrency.- Monitoring Multi-threaded Component-Based Systems.- A Generalised Theory of Interface Automata, Component Compatibility and Error.- On Implementing a Monitor-Oriented Programming Framework for Actor Systems.- Towards a Thread-Local Proof Technique for Starvation Freedom.- Reasoning about Inheritance and Unrestricted Reuse in Object-Oriented Concurrent Systems.- A Formal Model of the Safety-Critical Java Level 2 Paradigm.- Safety and liveness.- Deciding Monadic Second Order Logic over omega-words by Specialized Finite Automata.- Property Preservation for Extension Patterns of State Transition Diagrams.- Symbolic Reachability Analysis of B through ProB and LTSmin.- Model learning.- Enhancing Automata Learning by Log-Based Metrics.- Refactoring of Legacy Software using Model Learning and Equivalence Checking: an Industrial Experience Report.- On Robust Malware Classifiers by Verifying Unwanted Behaviours.- SAT and SMT solving.- Efficient Deadlock-Freedom Checking using Local Analysis and SAT Solving.- SMT Solvers for Validation of B and Event-B models.- Avoiding Medication Conflicts for Patients with Multimorbidities.- Testing.- Temporal Random Testing for Spark Streaming.- Combining Static Analysis and Testing for Deadlock Detection.- Fuzzing JavaScript Engine APIs.- Theorem proving and constraint satisfaction.- A Component-based Approach to Hybrid SystemsSafety Verification.- Verifying Pointer Programs using Separation Logic and Invariant Based Programming in Isabelle.- A Constraint Satisfaction Method for Configuring Non-Local Service Interfaces.- Case studies.- Rule-based Consistency Checking of Railway Infrastructure Designs.- Formal Verification of Safety PLC Based Control Software.- Enabling Static Driver Verifier using Microsoft Azure.

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