The authors introduce this new approach to programming language design, describe its evolution and design principles, and present a formal specification of a metaobject protocol for CLOS.

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Gregor Kiczales is a Member of the Research Staff in the System Sciences Laboratory at Xerox Palo Alto Research Center.

Jim des Rivi�res is a Member of the Research Staff in the System Sciences Laboratory at Xerox Palo Alto Research Center.

Daniel G. Bobrow is a Research Fellow in the Intelligent Systems Laboratory, Xerox Palo Alto Research Center, editor-in-chief of the Journal of Artificial Intelligence, and Chair of the Governing Board of the Cognitive Science Society.

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