This book constitutes the strictly refereed proceedings of the 11th European Conference on Object-Oriented Programming, ECOOP'97, held in Jyväskylä, Finland, in June 1997.The book presents 20 revised full papers selected from a total of 103 submissions;

GOODS to appear on the stage.- Balloon types: Controlling sharing of state in data types.- Static integrity constraint management in object-oriented database programming languages via predicate transformers.- Issues with exception handling in object-oriented systems.- Subtyping is not a good “match” for object-oriented languages.- Near optimal hierarchical encoding of types.- An extended Theory of Primitive Objects: First order system.- A reflective architecture for process control applications.- Dynamic object evolution without name collisions.- Aspect-oriented programming.- DRASTIC: A run-time architecture for evolving, distributed, persistent systems.- A general framework for inheritance management and method dispatch in object-oriented languages.- Optimizing Smalltalk by selector code indexing can be practical.- Objects, associations and subsystems: A hierarchical approach to encapsulation.- Towards a formalization of the Unified Modeling Language.- Coordination requirements expressed in types for active objects.- Java is type safe — Probably.- Feature-oriented programming: A fresh look at objects.- Genericity in java with virtual types.- Tool support for object-oriented patterns.- A model for structuring user documentation of object-oriented frameworks using patterns and hypertext.- Using patterns for design and documentation.- Going beyond objects with design patterns.