This is a historical account of the use of APL, in Japan from the personal observation of the author. This is not intended to be scientific nor objective or based on studies or surveys of any sort. The description is mostly about IBM APL, because the author was employed by IBM for a significant part of his active years with APL. But the author also believes himself to be amongst the most informed persons in the area of the use of APL in Japan regardless of interpreter's manufacturers by being an open and independent APL consultant for 10 years now with wide contacts with various individuals in the world of APL.
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