Good research uses sound measurement . Measurement in education usually involves assigning numbers to things in order to differentiate one thing from another. Numbers are used in different ways. Typically there are four different ways numbers are used. Numbers are distinct from one another.
Numbers are relative to one another.
Numbers are related to each other in identified units. Numbers can be related to each other proportionally. These distinctions are the basis for the scales of measurement. Nominal This scale is the most basic and least informative level of measurement. Reliability of measurement is based on proper categorization.