Temporary help services (THS), are services that are provided by the resources of temporary help firms. The THS On-Line System is an on-line procurement tool designed to assist federal departments in the National Capital Region, in their procurement of temporary help services up to $400,000 (including all subsequent amendments, travel/living expenses, overtime and Goods and Services Tax or Harmonized Sales Tax) and with an assignment period duration that does not exceed 48 consecutive weeks. On an exceptional basis only, a call-up or contract may be amended to extend the duration of an assignment period up to a maximum of 24 consecutive weeks beyond the limit of 48 consecutive weeks without Public Works and Government Services Canada (PWGSC) prior approval, on the condition that specified requirements are met.