<prompt> Translate the following text to EnglishSerikali ya Uingereza imetoa idhini kwa mashirika ya kimataifa kuomba msamaha wa kubadilika kwa usimamizi katika mipango yao ya utendaji wa kila mwaka kuanzia mwaka wa fedha wa 1999.  <response>: GPRA authorizes agencies to apply for managerial flexibility waivers in their annual performance plans beginning with fiscal year 1999. 