Helena Osana, PhD, is Associate Professor in the Department of Education at Concordia University. Her research focuses on the relationship between teachers' mathematical knowledge and the development of student understanding at the elementary level. She teaches mathematics methods to preservice teachers and is actively involved in providing professional development to teachers across Quebec. Dr. Osana's current SSHRC-funded research is exploring the nature of tasks in elementary mathematics methods courses and preservice teachers' modes of engagement with such tasks. Dr. Osana has published extensively on the topic of numeracy.