From the reviews:
"The origin of this book is the conference Explanation and Proof in Mathematics: Philosophical and Educational Perspectives (Essen, 2006) and it reflects different views from three fields: mathematics educators, philosophy of mathematics and history of mathematics. ... The authors and editors made a fine job providing a useful resource for all interested in proofs and proving in mathematical education." (Claudi Alsina, Zentralblatt MATH, Vol. 1196, 2010)
"The origin of this book is the conference Explanation and Proof in Mathematics: Philosophical and Educational Perspectives (Essen, 2006) and it reflects different views from three fields: mathematics educators, philosophy of mathematics and history of mathematics. ... The authors and editors made a fine job providing a useful resource for all interested in proofs and proving in mathematical education." (Claudi Alsina, Zentralblatt MATH, Vol. 1196, 2010)