In what circumstances is the court likely to award payment to a subcontractor on the terms of “Quantum Meruit”.

1. Where the subcontractor has performed its work, but part of the work contains deficiency.
2. Where the subcontractor has performed extra work under a signed change order.
3. Where the subcontractor has performed part of his work, but the subcontract is bankrupt.
4. Where the subcontractor and the other contracting party have failed to reach the necessary agreement on matters sufficient to constitute a contract but work has already been performed.