Genesis 1:31

"God saw all that he had made, and it was very good. And there was evening, and there was morning—the sixth day."  Genesis 1:31 NIV

Now that everything has been created, God looks over it all and sees that it is very good.  In all the places before that "very" is not used.  So all together, it is very good.  Everything, the system he had placed together and the components of that system all worked together perfectly making creation not just good, but very good.