The demonstration has to be done by a Level II or Level III Examiner, other than the supervising Level III, who is qualified and certified to perform the examination method and technique specified by the written procedure. The demonstrator shall have a good knowledge of the procedure and technique to be performed. He/she should be conversant with the requirements and the variables. The knowledge of the demonstrator gives a good confidence to the Inspector and customer even on the procedure. In the same manner, we have to ensure that the detection of discontinuity is not missed in the job.