<prompt> Translate the following text to EnglishUtaratibu wa Utendaji wa Mtendaji Mkuu wa IRS: Vipengele vya Utendaji: Viwango vya Utendaji kwa Vipengele vya Utendaji: Viwango vya Utendaji kwa Ratings ya muhtasari  <response>: IRSs Senior Executive Performance Plans37 Performance Elements37 Performance Standards for Elements38 Performance Standards for Summary Ratings39 