Not everybody learns alike - about every 10th child struggles with difficulties in reading, writing or calculation. The reasons for this and the remedy are topic of this work. Learners differ from one another. If and to what extent leaning is successful depends on the pedagogic measures undertaken bearing these differences in mind. This book gives the reasons for learning and achieving difficulties in school and introduces methods of enhancement. A perspective of cognitive psychology is introduced looking at individual preconditions of learning, instruction and educational institutions.