Reliability, Availability, and Maintainability

U.S. government contracting
Reliability, Availability, and Maintainability (RAM) refers to

"[r]equirement imposed on acquisition systems to ensure they are operationally ready for use when needed, will successfully perform assigned functions, and can be economically operated and maintained within the scope of logistics concepts and policies. RAM programs are applicable to materiel systems; test measurement and diagnostic equipment, training devices; and facilities developed, produced, maintained, procured, or modified for use."