Over the years a number of training techniques and procedures have been developed that are not part of the mainstream but are believed by some to have utility for organizations trying to enhance human pevformance. This article discusses four of these alternative techniques-subliminal self-help, mental imagery and practice, meditation, and Neurolinguistic Programming (NLP)-and examines the contributions of each from a scient$c perspective. With the exception of mental practice, there is a paucity of data to demonstrate convincingly whcther thesc alternative techniques promote or enhance individual or organizational effectiveness. It is concluded that effective professional practice depends on scientlfically derived research results.Training and development has historically been plagued by charlatans hawking this or that program or approach as having a significant positive impact on profits, effectiveness, absenteeism, turnover, and so on. Fads and techniques that come and go abound in this discipline: participation training is the style for a few years, then total quality management training surfaces; management by objectives comes and zero defects goes; T-groups are the darling of training professionals for a while; time management is "in" and job enrichment is "out"; Kepnor-Tregoe is popular for a time and then the one-minute manager takes its turn in the spotlight. Although these approaches are generally considered mainstream, others that have app eared are less traditional but also have significant followings proclaiming their effectiveness.As a class, the latter techniques are considered extraordinary; they are developed outside of mainstream science and are accompanied by extreme claims for high effectiveness (Austin and Miller, 1992). These claims are often