This volume investigates the state of object-oriented programming, systems, and application development as presented at the 1999 OOPSLA conference. The Association for Computing Machinery (ACM) compiles these proceedings to document the technical advancements, research papers, and panel discussions that defined the object-oriented paradigm at the turn of the millennium. The text serves as a historical record of the methodologies and theoretical frameworks that influenced software architecture during this period.

Experts and historians of computing view these proceedings as a foundational archive for understanding the development of modern software engineering practices. Researchers frequently consult this text to trace the historical lineage of specific object-oriented design patterns and language features.