This handbook addresses the overall LORA process and its associated activities, the selection and tailoring of those activities to meet DoD program supportability objectives, and sample contract language for acquiring LORA deliverables. The handbook offers implementation guidance on SAE AS1390, Level of Repair Analysis, activities as an integral part of the overall systems engineering process. The information contained herein is applicable, in part or in whole, to all system acquisition programs, major modification programs, and applicable research and development projects requiring LORA through all phases of the product life cycle. The focus of this handbook is to provide guidance to the members of the defense acquisition workforce who are responsible for the supportability of materiel systems requiring LORA. This handbook is for guidance only and cannot be cited as a requirement.