The test oracle problem is one of the most challenging problems in software testing. Metamorphic testing (MT) is an effective method for alleviating the oracle problem. MET: The First International Workshop on Metamorphic Testing will bring together researchers in academia and industry in order to provide a platform for discussing research results and experiences in the area of metamorphic testing. The ultimate goal of MET is to provide a platform for metamorphic testing researchers and practitioners who are interested in MT to present their novel ideas and discuss the state of research in metamorphic testing.