<prompt> Translate the following text to EnglishKwa upande mwingine, ni kiasi gani cha gharama za wateja zinapaswa kuwa na msingi wa kukubalika kwa mkataba, na ni nini kinachohitajika ili kuamua gharama za mkataba?  <response>: Third, how rigorous and defensible would customer-specific costs have to be in order to qualify as an acceptable base for a contract, and would the costing receive review by any outside party? 