![]() The tape measure yields reliable results. Measure it repeatedly and you consistently get a measurement of 2 1/2 feet. Measure - you get a measurement of 2 1/2 feet. Say you have a piece of wood that is 2 1/2 feet long. Think about measurement processes in other contexts - in construction or woodworking, a tape measure is a highly reliable measuring instrument. Reliability is concerned with questions of stability and consistency - does the same measurement tool yield stable and consistent results when repeated over time. These two concepts are validity and reliability.
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