The idea of teachers Learning through Teaching (LTT) - when presented to
a naïve bystander - appears as an oxymoron. Are we not supposed to learn
before we teach? After all, under the usual circumstances, learning is
the task for those who are being taught, not of those who teach.
However, this book is about the learning of teachers, not the learning
of students. It is an ancient wisdom that the best way to "truly learn"
something is to teach it to others. Nevertheless, once a teacher has
taught a particular topic or concept and, consequently, "truly learned"
it, what is left for this teacher to learn? As evident in this book, the
experience of teaching presents teachers with an exciting opp- tunity
for learning throughout their entire career. This means acquiring a
"better" understanding of what is being taught, and, moreover, learning
a variety of new things. What these new things may be and how they are
learned is addressed in the collection of chapters in this volume. LTT
is acknowledged by multiple researchers and mathematics educators. In
the rst chapter, Leikin and Zazkis review literature that recognizes
this phenomenon and stress that only a small number of studies attend
systematically to LTT p- cesses. The authors in this volume purposefully
analyze the teaching of mathematics as a source for teachers' own
learning.