Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. APL has been used since the mid 1960s on mainframe computers and has itself evolved in step with computers and the computing market. APL is not widely used, but minimalistic and high-level by design, at several points in its history it could have captured a more significant market share, but never did. APL first appeared on large mainframe computers and, like C and Pascal, did find its way to CP/M and MS-DOS based microcomputers. Unlike C and Pascal, APL did not flourish in the microcomputer arena until hardware of sufficient computing power became commonly available. Perhaps accounting for its lack of mainstream appeal, APL's characteristics have always led to much criticism of the language. As always, such complaints may arise from misconceptions, have origins in distant APL history and be no longer be relevant today, or they may have some degree of validity. This article is concerned only with the latter two categories.

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