Saturday's goalless draw at home to West Brom has left Irvine's men in fifth spot going into the international break.
"I think we are progressing," said Irvine.
"People just have to look at the fact that West Brom came to Deepdale with a more defensive team than they would normally have and I think that shows that people believe we have made progress.
"It's a mark of the development within the group and we are delighted with that. We have built a good reputation for ourselves and that's great."