Appendix D Glossary of Terms

Multitiered inspection program An inspection program that includes periodic inspections conducted to different degrees of detail by inspectors of varying qualifications depending on the interval of time since the last indepth inspection, condition and age of the structure, or damage that has occurred to the structure from natural or manmade events.

Quality assurance (QA) The use of sampling and other measures to assure the adequacy of quality control procedures to verify or measure the quality level of the entire bridge inspection and load rating program (NBIS Regulation 23 CFR 650.305 Definitions).

Quality control (QC) Procedures intended to maintain the quality of a bridge inspection and load rating at or above a specified level (NBIS Regulation 23 CFR 650.305 Definitions).