definiens: shall mean the development costs as defined by the IDC and later incurred by each party with respect to an Option Product, from the Effective Date of the Development License and Commercialization Agreement through the later of ( i ) the date of Registration ( including thereafter costs to maintain or expand such Registration including Registration of additional Indications, formulations, presentations and Phase IIIb and IV Clinical Trials ) of such Option Product in the Field, or ( ii ) the date of termination of development efforts of such Option Product in the Field for which Registration is sought . Such costs shall comprise those costs required to obtain, maintain and/or expand the relevant authorization and/or ability to manufacture, formulate, fill, use, ship, sell and/or distribute such Option Product in commercial quantities to Third Parties . It is explicitly understood that any cost incurred in any territory pursuant to which developments are also used in the United States, shall entitle such developer to include such Development Cost within the cost consolidation mechanism and computations set out in the Financial Appendix