Self-help ideas generally belong to one of three schools of thought, whether the originators realize it or not: values-first, goals-first or process-first. Norman Vincent Peale (Power of Positive Thinking, 1952), Wayne W. Dyer (Erroneous Zones, 1976) and David Allen (GTD, 2002) are the authors of the pioneering mainstream classics of each sub-genre. Those dates are significant: the schools evolved and matured in that order, each building on the last to some extent.
