This document discusses the use of non-destructive testing methods like ultrasonic testing and EMAT to assess the condition of boiler tubes in power plants. It reviews previous research that has aimed to develop improved methodologies for evaluating tube wall thickness, detecting damage from corrosion and overheating, and predicting remaining tube life. The key methods discussed are using EMAT to non-contact measure wall thickness and ultrasonics to measure internal oxide layers as indicators of microstructure degradation. The document proposes that combining the results from these two NDT methods can provide a better assessment of tube condition than considering damage mechanisms separately.