De or het faseverandering?

The correct Dutch article is:

de faseverandering

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

How to use faseverandering

the faseveranderingde faseverandering
this faseveranderingdeze faseverandering
that faseveranderingdie faseverandering
our faseveranderingonze faseverandering
your faseveranderingjouw faseverandering
every faseveranderingelke faseverandering
which faseverandering?welke faseverandering?
a big faseverandering / the big faseveranderingeen grote faseverandering, de grote faseverandering