This book was written by lecturers in Computers Science Education from three different universities in South Africa. It is a methodological guide to effective teaching of the school subjects IT and CAT. It is an easily understandable, practical guide aimed at student teachers in IT and CAT, but will also assist IT and CAT teachers in their strive to improve their teaching. Activities and assignments are included to assist students in the acquisition of skills and to guide facilitators in the assessment of the outcomes.