Mary Deboys was a practising teacher and assistant organiser in the Queen's University of Belfast Teachers' Centre. Her book, Lines of Development in Primary Mathematics co-authored with Eunice Pitt, is an excellent reference for teachers, PGCE and NQT students. Topics such as capacity or volume are clearly set out making it an essential resource when introducing or developing mathematical concepts in the primary classroom.

Eunice Pitt was a practising teacher and assistant organiser in the Queen's University of Belfast Teachers' Centre. In her book, Lines of Development in Primary Mathematics co-authored with Mary Deboys, she focuses on the teaching of infant classes. It is an excellent reference for teachers, PGCE and NQT students. Topics such as capacity or volume are clearly set out, making it an essential resource when introducing or developing mathematical concepts in the primary classroom.