progress?

So, I am wondering how to keep my house from looking like this

at the end of every day?

It seems I have 4 of the messiest kids on earth living in my house. No matter how I try to instill orderliness, they seem incapable of maintaining it! Finally, after an hour of hounding them to clean up, it looked like this when they went bed last night...

Only to be repeated again today! Is there any hope?