All disputes and differences of any kind whatever arising out of or in connection with this Contract of the carrying out of the works (whether during the progress of the works or after their completion and whether to) and settled by the Engineer-n-charge who shall state his decision in writing. Such decision may be in the form of Final Certificate or otherwise. The decision of the Engineer-in-charge with respect of any of the excepted matters shall be final and without appeal as stated in the said Clause. But if the Contractor be dissatisfied with the decision of the Engineer-in-charge on any other matter, question or disputes of any kind (except any of the excepted matters) or as to the withholding by the Engineer-in-charge of any certificates to which the contractor may claim to be entitled then and in any such case, may within twenty-eight days after receiving notice of such decision give a written notice to the Engineer-in-charge requiring that such matters in dispute be arbitrated upon. Such written notice shall specify the matters which are in dispute and such dispute or difference of which such written notice has been given and no other shall be referred to the Arbitrated and final decision of a sole Arbitrator being a Fellow of the Indian Institute of Architects/Indian Institute of Engineers to be agreed upon and appointed by both parties. The Arbitrator shall have power to open up, review and revise any certificate, opinion, decision, requisition or notice, save in regard to the excepted matters referred to the preceding clause and to determine all matters in dispute which shall be submitted to him or them and of which notice shall have been given as aforesaid.