▁number ▁of ▁concepts ▁and ▁caus al ▁relationships ▁between ▁them ▁( cir cles ▁and ▁ar rows ▁on ▁the ▁diagram ) ▁to ▁measure ▁the ▁bread th ▁and ▁depth ▁of ▁understanding ▁reflected ▁in ▁the ▁theory ' s ▁structure . ▁The ▁measure ▁for ▁bread th ▁is ▁the ▁number ▁of ▁concepts . ▁This ▁is ▁based ▁on ▁the ▁idea ▁that ▁real - world ▁programs ▁involve ▁a ▁lot ▁of ▁inter connected ▁parts , ▁therefore ▁a ▁theory ▁that ▁shows ▁a ▁larger ▁number ▁of ▁concepts ▁shows ▁greater ▁bread th ▁of ▁understanding ▁of ▁the ▁program . ▁The ▁depth ▁is ▁the ▁percentage ▁of ▁concepts ▁that ▁are ▁the ▁result ▁of ▁more ▁than ▁one ▁other ▁concept . ▁This ▁is ▁based ▁on ▁the ▁idea ▁that , ▁in ▁real - world ▁programs , ▁things ▁have ▁more ▁than ▁one ▁cause . ▁Hence , ▁a ▁concept ▁that ▁is ▁the ▁result ▁of ▁more ▁than ▁one ▁other ▁concept ▁in ▁the ▁theory ▁shows ▁better ▁understanding ▁of ▁that ▁concept ; ▁a ▁theory ▁with ▁a ▁higher ▁percentage ▁of ▁better - under stood ▁concepts ▁shows ▁a ▁greater ▁depth ▁of ▁understanding ▁of ▁the ▁program . ▁ ▁Ass ess ing ▁implementation ▁Process ▁analysis ▁looks ▁beyond ▁the ▁theory ▁of ▁what ▁the ▁program ▁is ▁supposed ▁to ▁do ▁and ▁instead ▁evalu ates ▁how ▁the ▁program ▁is ▁being ▁implemented . ▁This ▁evaluation ▁determ ines ▁whether ▁the ▁components ▁identified ▁as ▁critical ▁to ▁the ▁success ▁of ▁the ▁program ▁are ▁being ▁implemented . ▁ ▁The ▁evaluation ▁determ ines ▁whether ▁target ▁populations ▁are ▁being ▁reached , ▁people ▁are ▁receiving ▁the ▁intended ▁services , ▁staff ▁are ▁ade qu ately ▁qualified . ▁Process ▁evaluation ▁is ▁an ▁on going