MIL-HDBK-109 (H-109), QUALITY CONTROL AND RELIABILITY - STATISTICAL PROCEDURES FOR DETERMINING VALIDITY OF SUPPLIERS ATTRIBUTES INSPECTION OF. This purpose of this handbook is to provide appropriate statistical tests and tables of critical values to Department of Defense procurement inspection and quality control activities for use in determining the validity of suppliers' inspection records when sampling inspection by attributes is specified. Such records to assure the consumer that only supplies conforming with technical requirements are being offered for acceptance.