“…Past gender and observer bias research (e.g., Condry & Ross, 1985;Gurwtiz & Dodge, 1975;Kirch, 1999;Lyons & Serbin, 1986;Susser & Keating, 1990) has focused exclusively on physical aggression (e.g., kicking, hitting, threatening physical force), which is more common in boys (Coie & Dodge, 1998), and researchers have neglected other forms of aggression that may be more common in girls. Relational aggression, which is defined as the removal, or the threat of the removal, of a relationship as the means of harm (e.g., giving the silent treatment or ignoring a peer, excluding peers from play or activities, spreading malicious lies or gossip, Crick & Grotpeter, 1995) appears to be more frequent among girls and women across developmental periods (cf.…”