"Does that mean something more than the plain sense of it?"

In their own twisted terms, it's sound business practice and plain common sense.

To me it's just plain common sense that you deal with the first by using the second.

But I've always held out for plain common sense.

In any case they were the result of plain common sense.

This art form is learned continuously through experience, ability and just plain visual sense.

But the analysis, parts of that are just plain common sense.

What happened to the days of good manners and plain old common sense?

Now that's what a person with plain common sense does!

Nothing ever showed, in such a strong light, the plain good sense of Marion.