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The first APL workspace became available at IBM on November 27, 1966, making 1991 the twenty-fifth anniversary of APL. The ZBM Systems Journal joins in the anniversary celebration by presenting 12 papers and one essay covering APL'S history, implementation, and applications. We are indebted to R. P. Polivka of the IBM Data Systems Division in Poughkeepsie, New York, for his extensive contributions to the planning and development of this issue, including the solicitation of numerous papers and suggestions for referees. We also commend and thank J. McGrew of the IBM Application Solutions Division in Kingston, New York, for his considerable efforts in ensuring the proper appearance of APL throughout the issue.
Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.