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Rotter (1990) describes the external locus of control as: 'the degree to which persons expect that the reinforcement or outcome is a function of chance, luck, or fate, is under the control o f powerful others, or is simply unpredictable.'.
Threats to Internal & External Validity. â  The controlled or experimental design enables the. investigator to control for threats to internal and. external validity. â  Threats to internal validity compromise our confidence. in saying that a relationship exists between the. independent and dependent variables.