by Joseph Weizenbaum Since the dawn of the age of computers, people have cursed the difficulty of programming. Over and over again we encounter the suggestion that we should be able to communicate to a computer in natural language what we want it to do. Unfortunately, such advice rests upon a misconception of both the computer and its task. The computer might not be stupid, but it is stubborn. That is, the computer does what all the details of its pro gram command it to do, i. e., what the programmer "tells" it to do. And this can be quite different from what the programmer intended. The misun derstanding with respect to tasks posed to the computer arises from the failure to recognize that such tasks can scarcely be expressed in natural language, if indeed at all. For example, can we practice music, chemistry or mathematics without their respective special symbolic languages? Yet books about computers and programming languages can be written more or less reasonably, even if they are not quite poetic or lyrical. This book can serve as an example of this art and as a model for anyone at tempting to teach inherently difficult subject matters to others. Klagenfurt, April 1995 Preface Striving to make learning to program easier, this book addresses primarily students beginning a computer science major. For our program examples, we employ a new, elegant programming language, Modula-3."

The mission of JMLC is to explore the concepts of well-structured rogramming languages and software, and those of teaching good design and programming style. A special interest is the construction of large and distributed software systems. JMLC - in the future it may be renamed to PMLC (Programming Methodology and Languages) - has already a long tradition; earlier confer- ces were held in 1987 (Bled, Slovenia), 1990 (Loughborough, UK), 1994 (Ulm, Germany), 1997 (Linz, Austria) and 2000 (Zuric .. h, Switzerland). JMLC 2003 attracted 47 papers from 10 countries (Australia, Austria, Czech Republic, Germany, Hungary, Italy, Switzerland, Russia, UK, USA). Each paper was reviewed by three representatives of the international program committee. Seventeen papers were accepted as full and 10 further papers as short contri- tions. In a second, simpli?ed reviewing process the editors of this proceedings checked that all authors had accounted for the detailed comments of the rev- wers. In addition to the regular program, JMLC 2003 invited ?ve distinguished speakers: Niklaus Wirth (ETH Zuric .. h), Michael Franz (UCI, Irvine), Jayadev Misra (UT, Austin), C.A.R. Hoare (Microsoft Research and Oxford University) and Jim Miller (Microsoft Corporation), the latter two in common with the co-located EuroPar 2003 conference. JMLC 2003 invited four tutorials: On .NET (Hanspeter M.. ossenb. ock, Wo- gang Beer, Dietrich Birngruber and Albrecht W.. oss, University Linz and Tech- Talk);C# (JudithBishop,UniversityofPretoriaandNigelHorspool,University of Victoria); and Design by Contract and the Ei?el Method and Trusted Com- nentsandAttemptsatProofs (BertrandMeyer,ETHZuric .. handEi?elSoftware).

This book constitutes the refereed proceedings of the Third International Conference of the Austrian Center for Parallel Computation, ACPC '96, held in Klagenfurt, Austria, in September 1996.
The 15 revised full papers presented together with two keynote contributions were selected from 31 submissions by authors from 13 countries. Also included are two industrial papers and six posters. The topical emphasis of the book is on parallel databases and parallel input/output aspects; however also other topics are addressed, like parallel hardware, parallel numerics, parallel languages, and tools and algorithms.

Die Schwierigkeit der Programmierung liegt darin, dass wir unsere Ideen in eine Form bringen mussen, die maschinell verarbeitet werden kann. Diese Umsetzung von Ideen in mechanische Form fallt oft schwer und kann den Anfanger entmutigen. Das Buch zeigt, wie durch richtige Strukturierung, durch die Ausbildung eines guten Stils, auch komplexe Programme geschrieben und verstanden werden koennen. Dazu bedient es sich der Sprache Modula-3, die als Nachfolger von Pascal und Modula-2 auf den in diesen Sprachen bereits bewahrten Konzepten aufbaut und sie erweitert. Der dadurch ermoeglichte Programmierstil fuhrt schrittweise uber den Umgang mit komplexen Datentypen und Algorithmen hin zu modernen und anspruchsvollen Themen wie objektorientierte und parallele Programmierung. Dem Buch liegt eine Diskette mit dem vollstandigen Modula-3 System und UEbungsbeispielen bei. Fur Informatikstudenten im Grundstudium, F+E-Leute im Programmiersprachenmarkt.