English to German Bus/Financial Business/Commerce (general)

Context: Report on a telecommunications company
"In addition to establishing detailed standards for all worker activities, this involved developing key performance indicators and other measures, as well as extensive training of *first supervisors* and line managers in the various system elements, which were to be installed in various facilities located throughout a broad geographic area."

Habe "first supervisors" mit "Vorgesetzten" übersetzt. Gibt es etwas Besseres?