The document summarizes Jane Squires' presentation at the First International Symposium of ASQ Research held in San Francisco in 2014. The presentation traced the development of the Ages & Stages Questionnaires (ASQ), a parent-completed child monitoring system, from its creation in the 1980s to its current widespread international use. The ASQ has been translated into multiple languages and culturally adapted for use in over 30 countries. Research studies have found the ASQ to be a valid, reliable and low-cost developmental screening tool.