The document discusses remedies available to a contractor if the employer fails to pay for three interim certificates issued by the architect. The contractor can: 1) suspend work until payment is made, as non-payment without reasonable cause is a serious breach of contract; 2) claim interest on the unpaid amounts; and 3) if non-payment continues, terminate their own employment, as allowed by clauses 30.7, 30.17, and 26.1(a) of the contract.