▁that ▁is ▁asking ▁the ▁questions ▁on ▁the ▁N PS ▁survey . ▁The ▁consumer ▁is ▁the ▁customer , ▁employee , ▁or ▁respond ent ▁to ▁an ▁N PS ▁survey . ▁An ▁N PS ▁can ▁be ▁as ▁low ▁as ▁− 1 0 0 ▁( every ▁respond ent ▁is ▁a ▁" det ractor ") ▁or ▁as ▁high ▁as ▁+ 1 0 0 ▁( every ▁respond ent ▁is ▁a ▁" prom oter "). ▁N PS ▁scores ▁vary ▁across ▁different ▁indust ries , ▁but ▁a ▁positive ▁N PS ▁( i . e ., ▁one ▁that ▁is ▁higher ▁than ▁zero ) ▁is ▁generally ▁de emed ▁good , ▁a ▁N PS ▁of ▁+ 5 0 ▁is ▁generally ▁de emed ▁excellent , ▁and ▁anything ▁over ▁+ 7 0 ▁is ▁exception al . ▁ ▁The ▁metric ▁was ▁developed ▁by ▁( and ▁is ▁a ▁registered ▁tra dem ark ▁of ) ▁Fred ▁Reich h eld , ▁B ain ▁& ▁Company ▁and ▁Sat met rix . ▁It ▁was ▁introduced ▁by ▁Reich h eld ▁in ▁his ▁ 2 0 0 3 ▁Harvard ▁Business ▁Review ▁article , ▁" The ▁One ▁Number ▁You ▁Need ▁to ▁G row ". ▁ ▁How ▁it ▁works ▁The ▁Net ▁Prom oter ▁Sc ore ▁is ▁calculated ▁based ▁on ▁responses ▁to ▁a ▁single ▁question : ▁How ▁likely ▁is ▁it ▁that ▁you ▁would ▁recommend ▁our ▁company / product / service ▁to ▁a ▁friend ▁or ▁colle ague ? ▁The ▁scoring ▁for ▁this ▁answer ▁is ▁most ▁often ▁based ▁on ▁a ▁ 0 ▁to ▁ 1 0 ▁scale . ▁ ▁Those ▁who ▁respond ▁with ▁a ▁score ▁of ▁ 9 ▁to