▁helps ▁you ▁to ▁clarify ▁your ▁understanding ▁of ▁your ▁program . ▁But ▁the ▁most ▁important ▁reason ▁for ▁undert aking ▁the ▁effort ▁is ▁to ▁understand ▁the ▁impact s ▁of ▁your ▁work ▁on ▁the ▁people ▁you ▁serve . ▁With ▁the ▁information ▁you ▁collect , ▁you ▁can ▁determine ▁which ▁activities ▁to ▁continue ▁and ▁build ▁upon , ▁and ▁which ▁you ▁need ▁to ▁change ▁in ▁order ▁to ▁improve ▁the ▁effect iveness ▁of ▁the ▁program . ▁ ▁This ▁can ▁involve ▁using ▁s oph istic ated ▁statistical ▁techniques ▁in ▁order ▁to ▁measure ▁the ▁effect ▁of ▁the ▁program ▁and ▁to ▁find ▁caus al ▁relationship ▁between ▁the ▁program ▁and ▁the ▁various ▁out comes . ▁More ▁information ▁about ▁impact ▁evaluation ▁is ▁found ▁under ▁the ▁heading ▁' Det erm ining ▁C aus ation '. ▁ ▁Ass ess ing ▁efficiency ▁Finally , ▁cost - ben ef it ▁or ▁cost - e ffic iency ▁analysis ▁ass esses ▁the ▁efficiency ▁of ▁a ▁program . ▁E valu ators ▁outline ▁the ▁benefits ▁and ▁cost ▁of ▁the ▁program ▁for ▁comparison . ▁An ▁efficient ▁program ▁has ▁a ▁lower ▁cost - ben ef it ▁ratio . ▁There ▁are ▁two ▁types ▁of ▁efficiency , ▁namely , ▁static ▁and ▁dynamic . ▁While ▁static ▁efficiency ▁concerns ▁ach ieving ▁the ▁object ives ▁with ▁least ▁costs , ▁dynamic ▁efficiency ▁concerns ▁continuous ▁improvement . ▁ ▁Det erm ining ▁caus ation ▁Perhaps ▁the ▁most ▁difficult ▁part ▁of ▁evaluation ▁is ▁determ ining ▁whether ▁the ▁program ▁itself ▁is ▁causing ▁the ▁changes ▁that ▁are ▁observed ▁in ▁the ▁population ▁it ▁was ▁aim ed ▁at . ▁Events ▁or ▁processes ▁outside ▁of ▁the ▁program ▁may ▁be