Identifying microbiologically influenced corrosion or MIC is not always straightforward. In case MIC is suspected it is appropriate to perform extra tests on the medium or on the deposit/corrosion product to confirm the presence of micro-organisms and the risk for MIC. In case a relevant water sample is available, a BART (Biological Activity Reaction Test) can be performed to evaluate the presence of different bacterial groups. Besides other techniques like FTIR-spectroscopy or Q-PCR can be performed on the deposit/corrosion products.