Quality/Ripeness level: there is an ascending
hierarchy of quality levels, which are determined mainly (though not
exclusively) by the sugar
content of the grapes before fermentation, their "must weight". The
lowest qualities, Tafelwein and Landwein are normally best avoided. The
next level is "Qualitätswein bestimmter Anbaugebiete" (QbA),
which can be of descent quality. Occaisonally, top quality wines are
sold as QbA's, or even Tafelwein, if they violate additional legal
restrictions, for example by using new oak barrels.
Chaptalisation is allowed for QbA's. No such addition of
sugar is allowed for "Qualitätswein mit Prädikat" (QmP),
which comes in 6 levels (the "Prädikate"). They are in ascending
order of must weights:
Kabinett < Spätlese < Auslese < Beerenauslese (BA) and Eiswein
(ice wine) < Trockenbeerenauslese (TBA)
The extreme must weights of BA's and TBA's are achieved by
using botrytised grapes (see picture). Eiswein is made from naturally
frozen grapes.