The self-help philosophy relies more on first-hand knowledge (or folk knowledge) than empirical data.
An expansion of the technologies that empower individuals to conduct both trivial and profound activities binds together the diverse genres which apply self-help concepts. Self-help book-publishing arose from decentralization of ideology, from a growth of publishing industries using expanded printing technologies and (at the pinnacle of growth) from the spread of new psychological sciences. Likewise, self-help legal services grew around expanded access to document-production technology (viz: the printing industry in the 18th century). The Internet, with the ever-expanding selection of commercial and information services which it offers, exemplifies movement toward self-help on a grand scale.
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