"Self-appraisals of efficacy are reasonably accurate, but they diverge from action because people do not know fully what they will have to do, lack information for regulating their effort, or are hindered by external factors from doing what they can"

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Accurate processing of information about outcomes is no simple task under the variable conditions of everyday life . . . usually, many factors enter into determining what effects, if any, given actions will have, Actions, therefore, produce outcomes probabilistically rather than certainly. Depending on the particular conjunction of factors, the same course of action may produce given outcomes regularly, occasionally, or only infrequently

— Albert Bandura