Symptoms of the failure

You can identify a wait or loop condition by means of one of the following conditions:

Suspended activity while waiting for some condition to be satisfied
Endless instruction loop
Repetition of messages
Repetition of a sequence of ISMF panels
No system response; for example, an ISMF panel remains on the terminal screen indefinitely after the operator has taken action that should cause it to change

Because wait and loop failures are often hard to differentiate, this section documents both keywords.