▁both ▁quant itative ▁and ▁qual itative ▁methods ▁of ▁social ▁research . ▁People ▁who ▁do ▁program ▁evaluation ▁come ▁from ▁many ▁different ▁background s , ▁such ▁as ▁soci ology , ▁psych ology , ▁econom ics , ▁social ▁work , ▁and ▁public ▁policy . ▁Some ▁gradu ate ▁schools ▁also ▁have ▁specific ▁training ▁programs ▁for ▁program ▁evaluation . ▁ ▁Do ing ▁an ▁evaluation ▁ ▁Program ▁evaluation ▁may ▁be ▁conducted ▁at ▁several ▁stages ▁during ▁a ▁program ' s ▁lifetime . ▁Each ▁of ▁these ▁stages ▁ra ises ▁different ▁questions ▁to ▁be ▁answered ▁by ▁the ▁evalu ator , ▁and ▁corresponding ly ▁different ▁evaluation ▁approaches ▁are ▁needed . ▁Ros si , ▁Lip sey ▁and ▁Fre eman ▁( 2 0 0 4 ) ▁suggest ▁the ▁following ▁kinds ▁of ▁assess ment , ▁which ▁may ▁be ▁appropriate ▁at ▁these ▁different ▁stages : ▁▁ ▁Ass ess ment ▁of ▁the ▁need ▁for ▁the ▁program ▁ ▁Ass ess ment ▁of ▁program ▁design ▁and ▁logic / theory ▁ ▁Ass ess ment ▁of ▁how ▁the ▁program ▁is ▁being ▁implemented ▁( i . e ., ▁is ▁it ▁being ▁implemented ▁according ▁to ▁plan ? ▁Are ▁the ▁program ' s ▁processes ▁maxim izing ▁possible ▁out comes ?) ▁ ▁Ass ess ment ▁of ▁the ▁program ' s ▁outcome ▁or ▁impact ▁( i . e ., ▁what ▁it ▁has ▁actually ▁achieved ) ▁ ▁Ass ess ment ▁of ▁the ▁program ' s ▁cost ▁and ▁efficiency ▁ ▁Ass ess ing ▁needs ▁A ▁needs ▁assess ment ▁exam ines ▁the ▁population ▁that ▁the ▁program ▁int ends ▁to ▁target , ▁to ▁see ▁whether ▁the ▁need ▁as ▁concept ual ized