▁not ▁be ▁am ended : ▁▁ ▁Gra de ▁ 1 ▁= ▁excellent ; ▁ ▁Gra de ▁ 2 ▁= ▁good ; ▁ ▁Gra de ▁ 3 ▁= ▁ade qu ate ; ▁ ▁Gra de ▁ 4 ▁= ▁poor ; ▁ ▁Gra de ▁ 5 ▁= ▁awful . ▁ ▁Gra de ▁ 1 ▁represents ▁the ▁asp iration ▁that ▁the ▁organisation ▁see ks ▁to ▁provide ; ▁grade ▁ 2 ▁or ▁grade ▁ 3 ▁is ▁normally ▁equivalent ▁to ▁the ▁defined ▁standard ▁and ▁grade ▁ 5 ▁is ▁form ulated ▁to ▁represent ▁the ▁worst ▁performance ▁in ▁the ▁current ▁provision ▁of ▁a ▁service . ▁ ▁An ▁example ▁( using ▁the ▁quality ▁of ▁treated ▁eff lu ent ) ▁would ▁look ▁like ▁this : ▁▁ ▁Gra de ▁ 1 ▁- ▁excellent : ▁ 1 0 0 % ▁comp liance ▁with ▁zero ▁fail ures ; ▁ ▁Gra de ▁ 2 ▁- ▁good : ▁ 9 8 % ▁comp liance ; ▁ ▁Gra de ▁ 3 ▁- ▁ade qu ate : ▁better ▁than ▁ 9 5 % ▁comp liance ; ▁ ▁Gra de ▁ 4 ▁- ▁poor : ▁less ▁than ▁ 9 5 % ▁comp liance ; ▁ ▁Gra de ▁ 5 ▁- ▁awful : ▁less ▁than ▁ 8 0 % ▁comp liance ; ▁ ▁Wh ilst ▁the ▁basic ▁ 1 ▁to ▁ 5 ▁grad ing ▁system ▁is ▁always ▁un changed ▁( except ▁for ▁very ▁minor ▁modification ), ▁the ▁detail ▁is ▁tail ored ▁to ▁both ▁the ▁particular ▁industry ▁and ▁the ▁local ▁circumstances . ▁Here ' s ▁a ▁further ▁example ▁based ▁on ▁air line