(a)  If performance of a contract is ‘substantially’ close to complete performance, it must be accepted by the non-defaulting party and paid for to the extent it has been carried out.

(b)  Complete performance rather than ‘substantial’ performance of a contract is required and anything less than complete performance may be rejected by the non-defaulting party and no payment made.

(c)   If there is partial performance of a contract rather than ‘complete’ or ‘substantial’ performance, and that performance gives a benefit to the non-defaulting party, the performance must be accepted and paid for to the extent it has been carried out.