  In this talk we discus some properties of supersymmetric theories on
orbifolds in five dimensions. The structure of FI--tadpoles may lead to
(strong) localization of charged bulk scalars. Orbifold theories may suffer
from various kinds of anomalies. The parity anomaly may render the construction
of the orbifold theory ill--defined. The gauge anomaly on the orbifold are
localized at the fixed points, which can sometimes be canceled by a
Chern--Simons term.
