The main focus of this publication is on 'Eddy Current Testing' (ECT) to identify cracks in metals and alloys. Since the first Electromagnetic Nondestructive Evaluation (ENDE) workshop was held in London 1995, the workshops have contributed to the technical advance in ECT through competition and collaboration. ECT is put to practical use in industry now as one of the approved methods of crack detection in steels and metallic structures. Another important topic in this book is the magnetic NDE method according to the concept of NDE & Science Research Center.