Introduction: acquiring and performing cognitive skills, Ann M.Colley and John R.Beech. Part 1 Acquisition of cognitive skills: the development of cognitive skills - an examination of recent theories, Julie B.Sincoff and Robert J.Sternberg training skilled performance, John Annett learning problem-solving skills, K.J.Gilhooly and A.J.K.Green the componential approach to learning reading skills, John R.Beech acquisition of computing skills, Mark Elsom-Cook learning motor skills - integrating cognition and action, Ann M.Colley. Part 2 Variations in performance: a methodology for assessing the detailed structure of memory skills, K.Anders Ericsson and William L.Oliver executing two tasks at once, Paul J.Barber ageing and skilled performance, Timothy A.Salthouse stress and skill, L.R.Hartley et al diurnal variations in performance, Andrew Smith.