The contracting officer should use the form PWGSC- TPSGC 572 Task Authorization, for the authorization of tasks by both PWGSC and clients other than the Department of National Defence (DND). This form is available through the PWGSC Forms Catalogue Web site. Alternatively, any locally developed and approved task authorization forms may be used for non-DND contracts. The form DND 626 Task Authorization must be used in contracts for DND . Forms PWGSC- TPSGC 942 (Call-up against a Standing Offer), PWGSC-TPSGC 1379 (Work Arising or New Work), and GC 111 (Purchase Order) must not be used as a task authorization form in a contract with TAs.