<prompt> Translate the following text to EnglishTofauti muhimu lazima zidhaminiwe na msimamizi kabla ya mabadiliko kutokea, ikiwa inawezekana, au mara tu baada ya kutokea, ikiwa haiwezekani.  <response>: Material variances or deviations must be approved by the supervisor before the change occurs, if feasible, or promptly after occurring, if not feasible. 