Since the spelling test of Rice (1897), the fatigue test of Ebbinghaus (1897) and the intelligence scale of Binet (1905), the growth of tests has proceeded at an extraordinary pace in terms of volume, variety, scope and sophistication. The field of testing is so extensive that the comments that follow must needs be of an introductory nature and the reader seeking a deeper understanding will need to refer to specialist texts and sources on the subject. Limitations of space permit no more than a brief outline of a small number of key issues to do with tests and testing.