Force Account
You have learnt that direct contracting is used under a limited number or exceptional circumstances without inviting any open bids.
Force account is to make use of your own personnel and equipment, or to do the work or procure goods without prior agreement as required for lump sum or unit price. For example, when you have skilled labour for execution of certain components of the work, you need not call for bids for completing the work. However, you should justify this on economic grounds.