 The three most clear @-@ cut of these we call goal , effort and attainment of goal . ( Everyone needs to have goals whose attainment requires effort , and needs to succeed in attaining at least some of his goals . ) The fourth element is more difficult to define and may not be necessary for everyone . We call it autonomy and will discuss it later . ... We divide human drives into three groups : ( 1 ) those drives that can be satisfied with minimal effort ; ( 2 ) those that can be satisfied but only at the cost of serious effort ; ( 3 ) those that cannot be adequately satisfied no matter how much effort one makes . The power process is the process of satisfying the drives of the second group . 
