29. of course, as noticed earlier, parties may agree to waive the requirement of such notice under Section 21. However, in the absence of such express waiver, the provision must be given full effect to. The legislature should not be presumed to have inserted a provision that serves a limited purpose of only determining, for the purposes of limitation, when arbitration proceedings commenced. For a moment, even assuming that the provision serves only that purpose viz. fixing the date of commencement of arbitration proceedings for the purpose of Section 43(1) of the Act, how is such date of commencement to be fixed if the notice under Section 21 is not issued? The provision talks of the „Respondent‟ receiving a notice containing a request for the dispute “to be referred to arbitration”. Those words have been carefully chosen. They indicate an event that is yet to happen viz. the reference of the disputes to arbitration. By overlooking this important step, and straightaway filing claims before an arbitrator appointed by it, a party would be violating the requirement of Section 21, thus frustrating an important element of the parties consenting to the appointment of an arbitrator.