Sentence:  The extent to which we can persuade the less developed countries to appraise their own resources , to set targets toward which they should be working , to establish in the light of this forward perspective the most urgent priorities for their immediate attention , and to do the other things which they must do to help themselves , all on a realistic long-term basis , will <WSD>depend</WSD> importantly on the incentives we place before them . 
Meaning of the word marked with <WSD> tags:  be contingent upon (something that is elided)