Susan Sugarman finds that the dawn of reasoning in children coincides with the dawn of language, but one phenomenon is not reducible to the other.

Preface; 1. Introduction; 2. General method; 3. General features of spontaneous spatial constructions; 4. Class groupings in action: spontaneous serial ordering; 5. Class grouping in space: spontaneous organization; 6. Class grouping in space: provoked organization; 7. Between-class correspondence in action: the spontaneous reproduction of relations; 8. Between-class correspondence in space: spontaneous organization; 9. Between-class correspondence in space: provoked organization; 10. Summary: the organization of two mutually exclusive classes; 11. Classification by convergent criteria; 12. A note on seriation; 13. The verbal marking and coordination of classes and relations; 14. Conclusion; Appendix: manipulatory classification in six deaf preschoolers; References; Index.