This chapter includes 150 ECG tracings of different diseases for the purpose of self assessment. These are of different difficulties, some are easy, some are hard to interprete. It covers almost all possible ECG tracings that a student or doctor may face in any examination or in daily practice. The findings are given at the end. The purpose of this chapter is to provide the reader with a self practice tool so that they can try to interpret the ECG themselves and assess their competence.