Sentence:  These amendments to the Vocational Rehabilitation Act were designed to help provide for more specialized rehabilitation facilities , for more sheltered and `` half-way '' workshops , for greater <WSD>numbers</WSD> of adequately trained personnel , for more comprehensive services to individuals ( particularly to the homebound and the blind ) , and for other administrative improvements to increase the program 's overall effectiveness . 
Meaning of the word marked with <WSD> tags:  a concept of quantity involving zero and units