Sentence:  The 1954 Amendments completely changed the financing of the vocational rehabilitation program , providing for a three part grant structure - for ( 1 ) basic support ; ( 2 ) extension and <WSD>improvement</WSD> ; and ( 3 ) research , demonstrations , training and traineeships for vocational rehabilitation - and in addition for short-term training and instruction . 
Meaning of the word marked with <WSD> tags:  the act of improving something