One of the important program options is the re-run on failed resources. There is statistics which shows that with the large resources lists using re-run you can increase the number of successful resources by about 10%. For example, during the execution time some resources may not be available or not respond within the time allotted. And if restarting the run on the list of failed resources you increase the number of successful ones.
Everything is automatic; you only need to enable the appropriate option. In addition, you can set limitations, a certain condition, in case it is satisfied - to perform a re-run.