The only tactic that has worked for me is when I see one scratching where they shouldn't, I immediately remove them to the scratching post and gently rake their paws downward a few times and repeat this until they get the point. I have almost all leather furniture now and was scared of puncture marks but they all learned their lesson quickly, w/the exception of Creamsicle. I catch her occasionally and she knows she's wrong, too, because she looks around while she does it and if she sees me coming towards her, she runs, the little brat. She hasn't done that in a long time, though, so even she knows what to do and what not to do.

One thing, though: the problem w/cat condos that are covered in carpet is that the kitties don't understand why they're allowed to sharpen their claws on that carpet but not on the carpet that they walk on. It's good to get some sisal scratching posts. Most cats really like it. I used to have scratching posts on every floor and my RB Peeka would come downstairs to use the sisal one.