<prompt> Translate the following text to EnglishKwa kuongezea, utafiti wetu umeonyesha kuwa mashirika ya Marekani yamenufaika na matumizi yao ya makubaliano ya utendaji wa matokeo kwa watendaji wa kisiasa na wa juu wa kazi.  <response>: Further, our work has shown that U.S. agencies have benefited from their use of results-oriented performance agreements for political and senior career executives. 