This volume contains the proceedings of FORMATS 2005, the Third Inter- tional Conference on Formal Modelling and Analysis of Timed Systems, held in Uppsala, Sweden, September 26 28, 2005, in conjunction with ARTIST2 s- mer school, September 29 October 2, 2005, on Component Modelling, Testing and Veri?cation, and Static Analysis of Embedded Systems. FORMATS is an annual workshop series initiated in 2003. It is dedicated to the advancement of formaltheories,techniquesandsoftwaretoolsformodellingandanalysisoftimed systems. FORMATS 2003 wasassociatedto CONCUR 2003(International C- ference on Concurrency Theory), held in Marseilles, France. FORMATS 2004 was organized in conjunction with FTRTFT (Formal Techniques in Real-Time and Fault Tolerant Systems), Grenoble, France. This year, FORMATS received 43 submissions out of which 19 papers were selected for presentation by the ProgramCommittee. Each of the submitted - pers has been reviewed by at least three PC members and their sub-reviewers. The scienti?c program of FORMATS 2005 contained three invited talks: Lothar Thiele(ModularPerformanceAnalysisofDistributedEmbeddedSystems),Karl- ? Erik Arz en (Timing Analysis and Simulation Tools for Real-Time Control) and Parosh Abdulla (Veri?cation of Parameterised Timed Systems). The 19 - lected contributions cover work on semantics and modelling of timed systems, formalisms for modelling and veri?cation including timed automata, hybrid automata, and timed Petri nets, games for veri?cation and synthesis, mod- checking, case studies and issues related to implementation, security and perf- mance analysis.

Inhalt
Invited Talk.- Modular Performance Analysis of Distributed Embedded Systems.- Logic and Specification.- Real Time Temporal Logic: Past, Present, Future.- Translating Timed I/O Automata Specifications for Theorem Proving in PVS.- Specification and Refinement of Soft Real-Time Requirements Using Sequence Diagrams.- Times Games and Synthesis.- On Optimal Timed Strategies.- Average Reward Timed Games.- Beyond Liveness: Efficient Parameter Synthesis for Time Bounded Liveness.- Invited Talk.- Verification of Parameterized Timed Systems.- Model Checking.- Model Checking the Time to Reach Agreement.- Diagonal Constraints in Timed Automata: Forward Analysis of Timed Systems.- A New Verification Procedure for Partially Clairvoyant Scheduling.- Invited Talk.- Timing Analysis and Simulation Tools for Real-Time Control.- Hybrid Systems.- Automatic Rectangular Refinement of Affine Hybrid Systems.- Reachability Problems on Extended O-Minimal Hybrid Automata.- Counterexamples for Timed Probabilistic Reachability.- Petri Nets.- Time Supervision of Concurrent Systems Using Symbolic Unfoldings of Time Petri Nets.- Comparison of the Expressiveness of Timed Automata and Time Petri Nets.- Semantics.- Quantifying Similarities Between Timed Systems.- Performance of Pipelined Asynchronous Systems.- Is Timed Branching Bisimilarity an Equivalence Indeed?.- Semantics and Modelling.- Implementation of Timed Automata: An Issue of Semantics or Modeling?.- Timed Abstract Non-interference.