The QML program seeks to improve the part qualification process by certifying manufacturing lines rather than individual components. This book provides background on existing Qualified Parts List methods, defines the emerging QML system for both hybrid and monolithic microcircuits, and lists the status of QML vendors. Ongoing changes to MIL-H-38534 and MIL-I-38535, responsible DoD and industry organizations, certification and qualification procedures, and the national specification concept are covered.