Sentence:  An examination of some forty catalogs of schools offering courses in interior design , for the most part schools accredited by membership in the National Association of Schools of Art , and a <WSD>further</WSD> `` on the spot '' inspection of a number of schools , show their courses adhere pretty closely to the recommendations . 
Meaning of the word marked with <WSD> tags:  to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense)