... consistency of measurement, or the degree to which an instrument measures the same way each time it is used under the same condition with the same subjects (www.technetium.cen.brad.ac.uk). In short, it is the repeatability of the measurement. We can illustrate it with the example, if an applicant was being interviewed by two managers for a job in two separate interviews, the interview technique should provide some data so that the interviewers agreed with each other about the applicant as an individual. Alternatively, if a number of candidates are given the same selection test, the test should provide consistent results concerning individual differences between candidates. The statistical analysis of selection techniques normally provides a reliability coefficient which if closer to 1.0, more dependable the technique. Reliability improves as we increase the number of relevant items that are combined to generate a value. If we wanted to measure maths ability, we could give ...

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