CBC Radio's Ideas program is re-airing "It's a Girl's World," Lynn Glazier's audio documentary about the social world of girls where a hidden culture of nastiness lurks beneath a cultural facade of niceness. The series examines the tumultuous nature of female relationships from girlhood to adulthood.

The radio series, and its companion National Film Board of Canada documentary, features commentary from Professor Debra Pepler. Pepler is distinguished professor in the Faculty of Health's Department of Psychology, senior associate scientist at the Hospital for Sick Children, and a member of York's LaMarsh Centre for Research on Violence and Conflict Resolution.

Pepler is an expert on bullying behaviour among teens and children; Part 1 of the radio series sites groundbreaking research she conducted with Professor Wendy Craig of Queen's University into children's bullying activity on schoolyards. Craig and Pepler currently co-lead PREVNet (Promoting Relationships and Eliminating Violence Network), which provides anti-bullying resources for educators, parents and children.

Part 3 airs on January 21, 2011 at 9 pm on CBC Radio 1. Parts 1 and 2 are currently available for download on the Ideas website. A website connected to both the audio and film documentaries is also available with additional resources.