De or het routinehandeling?

The correct Dutch article is:

de routinehandeling

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

How to use routinehandeling

the routinehandelingde routinehandeling
this routinehandelingdeze routinehandeling
that routinehandelingdie routinehandeling
our routinehandelingonze routinehandeling
your routinehandelingjouw routinehandeling
every routinehandelingelke routinehandeling
which routinehandeling?welke routinehandeling?
a big routinehandeling / the big routinehandelingeen grote routinehandeling, de grote routinehandeling