Core activity determination for contract labour depends on Central Government referral, prescribed application procedure, and interim protection against adverse action. Where a question arises whether an establishment's activity is a core activity, the aggrieved party may apply to the Central Government, which may refer the application to a designated authority notified by that Government. The application must follow the form, manner and time period prescribed by general or special order. During the pendency of proceedings, no adverse action is to be taken so that the operation of the activity is not affected.