Pedometers represent an easy, inexpensive, accurate, and objective method used to monitor the physical activity levels of youth. In addition, pedometers are effective tools for motivating youth to become more physically active. Despite the utility of pedometers, consensus regarding pedometer-based guidelines for children and adolescents has not been reached. Initial studies on American children have determined that school-aged males accumulate significantly more steps/day than school-aged females. Furthermore, there is a consistent decline in accumulated steps/day as children move into middle and high school. Respectively, males and females in elementary school accumulate »13,000 and »11,000 steps/day, males and females in middle school accumulate »11,500 and »10,000 steps/day, and males and females in high school accumulate »10,500 and »9,500 steps/day. The Physical Activity Lifestyle Award (PALA), sponsored by the President's Council on Physical Fitness and Sport, is awarded to school-aged males who accumulate ³13,000 steps/day and females who accumulate ³11,000 steps/day for six consecutive weeks. The PALA standards are based on mean steps/day from a convenience sample of children. This limitation highlights the need for empirical approaches to establishing pedometer guidelines for youth. Initial BMI-referenced pedometer standards have been presented based on an international sample of children and suggest that males and females accumulate ³15,000 and ³12,000 steps/day, respectively. More research that attempts to establish practical pedometer guidelines (i.e., steps/day) associated with important health-related outcomes, such as obesity, is needed. Although there is an absence of pedometer-based physical activity guidelines for youth, there are new models of pedometers that provide researchers with additional information (i.e., intensity, duration, and patterns of physical activity) that can be related to existing physical activity guidelines for children and adolescents. Keyword(s): measurement/evaluation, physical activity, technology