Previous efforts have shown that the laser/light based NDE systems do generally provide sufficiently accurate measurements for validating MFL ILI. However, the specific samples studied lack metrics associated with large metal loss areas or areas of interacting metal loss. It is generally accepted that the performance would deteriorate in such conditions, but a comprehensive evaluation has not been performed. This project aims to provide an insight into the performance of these technologies as pertaining to the measurement of larger or interacting areas of metal loss on pipelines.