LEARNING BY NUMBERS or rather screen photographs. Dorling Kindersley Ltd have entered the computing arena with two large, slim, beautifully produced books for the Spectrum in a series called Screen Shot. Appropriately titled Step by step programming for the ZX Spectrum books 1 & 2 and written by Ian Graham most aspects of Spectrum BASIC programming is covered in simple colourful steps. Priced at £5.95 each they are worth looking at if you want easy to understand tuition.