This book surveys the work of the Second International Congress on Mathematical Education, and presents it as a picture of developing trends in mathematical education. At the end of August 1972 around 1400 people from seventy-three countries gathered for the Second International Congress on Mathematical Education in Exeter, UK. This book surveys the work of this conference, and presents it as a picture of developing trends in mathematical education. A number of themes emerged from the Congress. For example, there was great concern with the relationship between mathematics and the way in which the formation of mathematical concepts in affected by the use of language or the means in which children form the concepts from which mathematics can be drawn.