Most of the contributions to this volume are revised versions of papers presented at two symposia, organised by the editors, at the 4th Conference of the European Association for Research on Learning and Instruction in Turku, Finland, in 1991. Four of the contributors were specifically invited to submit a paper for this volume, so that the various approaches to intelligence, mind and reasoning are better presented. The contributions in the first part deal with intelligence and mind. The contributions in the second part deal with mind and reasoning. Robert Sternberg in the concluding chapter offers an overview and discussion of all the papers and, through an analogy, makes it clear that if we are to understand intelligence we need a multi-tradition approach that takes into account and perhaps transcends all individual approaches. This is a need also recognised by most of the contributors and the editors themselves, who feel that there are various levels of description of that evading entity called intelligence.