De or het vergunningstelsel?

The correct Dutch article is:

het vergunningstelsel

Rule Words ending in -sel: usually het. See the rule

How to use vergunningstelsel

the vergunningstelselhet vergunningstelsel
this vergunningstelseldit vergunningstelsel
that vergunningstelseldat vergunningstelsel
our vergunningstelselons vergunningstelsel
your vergunningstelseljouw vergunningstelsel
every vergunningstelselelk vergunningstelsel
which vergunningstelsel?welk vergunningstelsel?
a big vergunningstelsel / the big vergunningstelseleen groot vergunningstelsel, het grote vergunningstelsel