De or het echelonnering?

The correct Dutch article is:

de echelonnering

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

How to use echelonnering

the echelonneringde echelonnering
this echelonneringdeze echelonnering
that echelonneringdie echelonnering
our echelonneringonze echelonnering
your echelonneringjouw echelonnering
every echelonneringelke echelonnering
which echelonnering?welke echelonnering?
a big echelonnering / the big echelonneringeen grote echelonnering, de grote echelonnering