The simultaneous interpreter often lacks the necessary feedback to verify the success of his communication. The interpreter cannot devote much attention to monitoring his output. While the interpreter is constantly judging his colleagues and being judged by them, as well as by his audience - though not necessarily by identical standards - he himself hardly profits form this evaluation for self-improvement. One should therefore ask whether this lack of feedback and proper self-evaluation is detrimental to the simultaneous interpreter's performance. If there is a need for evaluation, one should ask what can be done to provide the interpreter with better insight into his performance and, in doing so, enhance his motivation to keep improving it. In order to answer this question the author first examines the standards by which simultaneous interpretation is to be judged, and then how the interpreter's performance can be evaluated in light of these standards.