SummaryThe speeds of silent tongue movements, repetition of individual consonants and repetition of a sequence of three consonants were measured in 300 British children between the ages of 4 1/2 and 9 1/2, and 13 1/2 and 14 1/2 years. The norms were obtained using simple, relatively inexpensive equipment. The procedure is described and some of the implications of the work discussed.