"There is no all-purpose measure of perceived self-efficacy. The "one-measure-fits-all" approach usually has limited explanatory and predictive value because most of the items in an all-purpose measure may have little or no relevance to the selected domain of functioning. Moreover, in an effort to serve all purposes, items in a global measure are usually cast in a general, decontextualized form leaving much ambiguity about exactly what is being measured and the level of task and situational demands that must be managed. Scales of perceived self-efficacy must be tailored to the particular domains of functioning that are the object of interest."

Albert Bandura
Guide to Creating Self-Efficacy Scales

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