The purpose of the PCMS - Task 2 is on the basis of long term measurements of corrosion rates and on-line combustion gas analysis to develop an algorithm being the heart of an online Predictive Corrosion Monitoring System (PCMS). The PCMS must be able of predicting the rate of corrosion of superheaters in WtE boilers on the basis of information about steam temperature and flue gas composition.The PCMS will on existing WtE plants make it possible to optimise the overall operational conditions and avoid critical situations (incl. unwanted types of waste) to give minimal corrosion thereby making it possible to increase the steam temperature and pressure and hence the efficiency of the power production. The PCMS will supply information making it possible to predict the residual service life of superheaters and avoid unexpected and expensive shutdowns. The PCMS will warn about inexpedient conditions during transitory operation and unwanted types of waste and through that promote better operation.New plants could be equipped with optimal (cheaper) superheater materials given that an in-stalled PCMS will optimise the operational conditions to mini-mise the corrosion rate complying with the resistibility of the material.