This volume contains revised and expanded versions of the papers presented at th the 15 Monterey Workshop, held during September 24-26, 2008 in Budapest, Hungary. The Monterey Workshops series was initiated in 1993 by Dr. David Hislop, a longtime program manager at the U. S. Army Research O?ce, with the purpose of exploring the critical problems associated with cost-e?ective development of high-qualitysoftwaresystems. During their 15-yearhistory, the MontereyWo- shops have brought together scientists that share a common interest in software development research serving practical advances in next-generation softwa- intensive systems. Each year is dedicated to a particular topic of critical - portance. In recent years, workshop topics were "Innovations for Requirement Analysis: From Stakeholders Needs to Formal Designs" (2007 in Monterey, C- ifornia), "Composition of Embedded Systems, Scienti?c and Industrial Issues" (2008inParis, France),"NetworkedSystems: RealizationofReliableSystemson Unreliable NetworkedPlatforms" (2005in Laguna Beach, California), "Software Engineering Tools: Compatibility and Integration"(2004 in Vienna, Austria), "Engineering for Embedded Systems: From Requirements to Implementation" (2003 in Chicago, Illinois), "Radical Innovations of Software and Systems En- neering in the Future" (2002 in Venice, Italy). The topic of the 2008 workshop was "Foundations of Computer Software, Future Trends and Techniques for Development. " Modern computer systems manage very large amounts of information, performing complex computations in a distributed way. At the same time, there is a need to display information in a way that aids human actors in the interpretation of this information and in decision making.

The algebraic approach to system speci?cation and development, born in the 1970sas a formalmethod for abstractdata types, encompassestoday the formal design of integrated hardware and software systems, new speci?cation fra- works and programming paradigms (such as object-oriented, logic, and high- order functional programming) and a wide range of application areas (including information systems, concurrent and distributed systems). Workshops on Al- braicDevelopmentTechniques,initiatedin1982asWorkshopsonAbstractData Types, have become a prominent forum to present and discuss research on this important area. The 14th International Workshop on Algebraic Development Techniques (WADT'99) took place at the Chat eau de Bonas, near Toulouse, September 15-18,1999,and was organized by Didier Bert and Christine Choppy. The main topics of the workshop were: - algebraic speci?cation - other approaches to formal speci?cation - speci?cation languages and methods - term rewriting and proof systems - speci?cation development systems (concepts, tools, etc.). The program consisted of invited talks by Michel Bidoit, Manfred Broy, Bart Jacobs, Natarajan Shankar, and 69 presentations describing ongoing - search. The parallel sessions were devoted to: algebraic speci?cations and other speci?cation formalisms, test and validation, concurrent processes, - plications, logics and validation, combining formalisms, subsorts and parti- ity, structuring, rewriting, coalgebras and sketches, re?nement, institutions and categories, ASM speci?cations. There were also sessions re?ecting - going research achieved in the Common Framework Initiative (CoFI, see http://www.brics.dk/Projects/CoFI/), within its di?erent task groups: CASL (Common Algebraic Speci?cation Language), CASL semantics, CASL tools, methodology, and reactive systems.

The algebraic specification of abstract data types has been a flourishing research topic in computer science since 1974. The main goal of this work isto evolve theoretical foundations and a methodology to support the design and formal development of reliable software. This volume gives the proceedings of the Eighth Workshop on Specification of Abstract Data Types, held jointly with the Third COMPASS workshop near Paris in August 1991. The main topics covered by the joint workshop are: - specification languagesand program development - algebraic specification of concurrency - theorem proving - object-oriented specifications - order-sorted algebras - abstract implementation and behavioral semantics. The volume contains four invited surveys and twelve contributed papers, all of which underwent a careful refereeing process.