In order to operate gas turbines reliably in a power plant setting, a lot of knowledge on maintenance and operational procedures is required. This involves knowledge in materials science, fatigue and heat loads. Specific training in these areas will be provided in the context of gas turbine operation. The recorded performance of Electrabel engines will be investigated and interpreted in the light of the findings acquired in this work package and in work packages 1, 2, 3 and 4. New tests on these engines will be conducted to validate numerical predictions (to be obtained with CFD and FEM).