▁and ▁the ▁long - term ▁effects ▁of ▁the ▁program . ▁The ▁five ▁levels ▁are ▁organized ▁as ▁follows : ▁ ▁Tier ▁ 1 : ▁needs ▁assess ment ▁( s ometimes ▁referred ▁to ▁as ▁pre - implementation ) ▁ ▁Tier ▁ 2 : ▁monitoring ▁and ▁account ability ▁ ▁Tier ▁ 3 : ▁quality ▁review ▁and ▁program ▁clar ification ▁( s ometimes ▁referred ▁to ▁as ▁understanding ▁and ▁ref ining ) ▁ ▁Tier ▁ 4 : ▁ach ieving ▁out comes ▁ ▁Tier ▁ 5 : ▁establish ing ▁impact ▁ ▁For ▁each ▁tier , ▁purpose ( s ) ▁are ▁identified , ▁along ▁with ▁corresponding ▁tasks ▁that ▁enable ▁the ▁identified ▁purpose ▁of ▁the ▁tier ▁to ▁be ▁achieved . ▁For ▁example , ▁the ▁purpose ▁of ▁the ▁first ▁tier , ▁Ne eds ▁assess ment , ▁would ▁be ▁to ▁document ▁a ▁need ▁for ▁a ▁program ▁in ▁a ▁community . ▁The ▁task ▁for ▁that ▁tier ▁would ▁be ▁to ▁assess ▁the ▁community ' s ▁needs ▁and ▁assets ▁by ▁working ▁with ▁all ▁relevant ▁st ake hold ers . ▁ ▁While ▁the ▁t iers ▁are ▁struct ured ▁for ▁consecutive ▁use , ▁meaning ▁that ▁information ▁gathered ▁in ▁the ▁earlier ▁t iers ▁is ▁required ▁for ▁tasks ▁on ▁higher ▁t iers , ▁it ▁acknowled ges ▁the ▁fluid ▁nature ▁of ▁evaluation . ▁Therefore , ▁it ▁is ▁possible ▁to ▁move ▁from ▁later ▁t iers ▁back ▁to ▁preceding ▁ones , ▁or ▁even ▁to ▁work ▁in ▁two ▁t iers ▁at ▁the ▁same ▁time . ▁It ▁is ▁important ▁for ▁program ▁evalu ators ▁to ▁note , ▁however , ▁that ▁a ▁program ▁must ▁be ▁evaluated ▁at