common practice
standard practice
normal practice

As is standard practice, the parents were not brought along.

It was standard practice for a person feeling his or her way in a relationship.

Do you remember the old days when it was standard practice to put one paper on top of another?

It was standard practice that no one came through for any reason.

They gave little thought to setting up a standard practice.

This is standard practice on the part of the Council.

This approach became a standard practice among major league officials.

That is standard practice, and there are even terms of art for it.

Actually, that has been standard practice for a few decades now.

All these procedures had become standard practice in a matter of just a few years.