Sentence:  They must continue to satisfy basic capital <WSD>needs</WSD> ; and there persists the dual problem of maintaining operational unity around a national program of modernization while simultaneously decentralizing participation in the program to wider and wider groups . 
Meaning of the word marked with <WSD> tags:  the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior