The 3 operators measure 15 electrodes, twice each, for a total of 90 measurements. The run order lists the order in which the measurements should be taken. The first measurement is part 3 by Operator 1, then part 14. In this case, Operator 1 makes all his measurements first, then Operator 2 and 3. All operators should finish their first replicates before starting the second sequence of replicates.