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Abstract
The randomised block design is used mainly to increase the power of an experiment by matching experimental units receiving different treatments. It is widely used in many disciplines where it is known by at least eight different names. One of these, “within subjects” is confusing because the term subjects has to be defined to fit the design and another “repeated measures”, is confusing because it is also used for an entirely different design. Failure to standardise nomenclature can cause confusion when teaching the principles of experimental design.