"Little did I know that I would be fortunate enough to develop several operating systems in my lifetime; developing one is a rare opportunity for anyone."

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The initial motive for developing APL was to provide a tool for writing and teaching. Although APL has been exploited mostly in commercial programming, I continue to believe that its most important use remains to be exploited: as a simple, precise, executable notation for the teaching of a wide range of subjects.

— Kenneth E. Iverson