This book gives insight in the vivid research area of early mathematics learning. The collection of selected papers mirror the research topics presented at the third POEM conference. Thematically, the volume reflects the importance of this relatively new field of research. Structurally, the book tries to guide the reader through a variety of research aims and issues and is split into four parts. The first two parts concentrate on teacher professional development and child learning development; the third part pools research studies creating and evaluating designed learning situations; and the fourth part bridges focuses on parent-child-interaction.