TheaimoftheARTS’99workshopistobringtogetherresearchersandpr- titioners interested in the design of real-time and probabilistic systems. It is intendedtocoverthewholespectrumofdevelopmentandapplicationofspec- cation,veri cation,analysisandconstructiontechniquesforreal-timeandpro- bilisticsystems. BeingaworkshopundertheumbrellaoftheAMASTmovement (AlgebraicMethodologyAndSoftwareTechnology),ARTSisintendedtoprovide aforumforthepresentationofapproachesthatarebasedonaclearmathema- calbasis. Aspectsofreal-timeandprobabilisticsystemsfortheworkshopinclude (butarenotlimitedto):compositionalconstructionandveri cationtechniques, automaticandmachine-supportedveri cation,casestudies,formalmethodsfor performanceanalysis,semantics,algorithmsandtools,andhybridsystems. ARTS’99wasorganisedbytheLehrstuhlfur ¨ Informatik7attheUniversity ofErlangen-Nurn ¨ bergandtookplaceattheSt¨adtlicheVolkshochschuleinB- berg(Oberfranken),GermanyfromMay26{28,1999.^ PreviouseditionsofARTS workshopswereorganizedbytheUniversityofIowa,USA(1993),Universityof Bordeaux,France(1995),BrighamYoungUniversity,USA(1996),andGeneral SystemsDevelopment,Mallorca,Spain(1997). Previousproceedingsappeared asLNCS1231orasbooksintheAMASTSeriesofComputing. TheProgramCommitteeselected17papersfromatotalof33submissions. Each submitted paper was sent to three Program Committee members, who wereoftenassistedbysub-referees. Duringaone-weekdiscussionviae-mail,the ProgramCommitteehasmadetheselectionofthepapersonthebasisofthe reviews. Thisvolumecontainsthe17selectedpapersplus3invitedpapers(in eitherfullorabstractform). IwouldliketothanktheProgramCommitteemembersandthesub-referees fortheire orts. Ialsoliketothanktheinvitedspeakersforgivingatalkatthe workshopandfortheircontributiontotheproceedings. SpecialthankstoUlrich Herzog,ChrisMoog,TeodorRus,DiegoLatellaandRuthAbraham(Springer- Verlag)fortheirsupport. Withouttheirhelp,thiseventwouldnothavebeen possible.^ March1999 Joost-PieterKatoen ProgramChair ARTS’99 Invited Speakers Bengt Jonsson (Uppsala University, Sweden) Frits W. Vaandrager(University of Nijmegen, The Netherlands) Moshe Y.^ Vardi (Rice University, USA) Steering Committee Manfred Broy (Technical University of Munich, Germany) Edmund Clarke (Carnegie Mellon University, USA) Ulrich Herzog (University of Erlangen-Nu ¨rnberg, Germany) Zohar Manna (Stanford University, USA) Maurice Nivat (University of Paris 6, France) Amir Pnueli (Weizmann Institute of Science, Israel) Teodor Rus (Chair, University of Iowa, USA) ProgramCommittee Rajeev Alur (University of Pennsylvania, USA) Jos Baeten (Eindhoven University of Technology, The Netherlands) Christel Baier (University of Mannheim, Germany) Miquel Bertran (University of Ramon Llull, Spain) Antonio Cerone (University of South Australia, Australia) Rance Cleaveland (SUNY at Stony Brook, USA) Jim Davies (Oxford University, UK) Colin Fidge (University of Queensland, Australia) David de Frutos (University of Madrid, Spain) Hubert Garavel (INRIA Rhone-Alpes, France) Constance Heitmeyer (Naval Research Laboratory, USA) Tom Henzinger (University of Berkeley,^ USA) Jane Hillston (University of Edinburgh, UK) Joost-Pieter Katoen (University of Erlangen-Nu ¨rnberg, Germany, Chair) Rom Langerak (University of Twente, The Netherlands) Kim G.