De or het auditplanning?

The correct Dutch article is:

de auditplanning

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

How to use auditplanning

the auditplanningde auditplanning
this auditplanningdeze auditplanning
that auditplanningdie auditplanning
our auditplanningonze auditplanning
your auditplanningjouw auditplanning
every auditplanningelke auditplanning
which auditplanning?welke auditplanning?
a big auditplanning / the big auditplanningeen grote auditplanning, de grote auditplanning