Article: The Softletter 100, published annually since 1984, is defined formally as "a ranking of the top 100 personal computer software companies in the U.S., based on calendar year revenues." That definition (which continues to evolve with the industry itself) helps explain why some companies appear on our list and why others are excluded.(Editorial)

NOTES ON METHODOLOGY

Our basic eligibility rules are simple: To be ranked, a company must be an independent, U.S.-based company (subsidiaries do not qualify) that generates at least 50% of its revenues from personal computer software development or publishing. For the great majority of the companies we review, eligibility is a straightforward issue. But every year we are challenged by several cases that we try to treat logically and consistently--not always to everyone's satisfaction.

Perhaps the biggest problem is creating a workable definition of "personal computing." Traditionally, personal computer software was any product that ran on a ...

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