De or het uniformering?

The correct Dutch article is:

de uniformering

Rule Words ending in -ing: almost always de. See the rule

How to use uniformering

the uniformeringde uniformering
this uniformeringdeze uniformering
that uniformeringdie uniformering
our uniformeringonze uniformering
your uniformeringjouw uniformering
every uniformeringelke uniformering
which uniformering?welke uniformering?
a big uniformering / the big uniformeringeen grote uniformering, de grote uniformering