I've recently got my account back up and running since the change in the UK and I'm doing a 'split test'. Could anybody point me in the right direction. - How many keywords (maximum) should I have in each Ad Group? - If one of my keywords gets a very good CTR does this effect the ranking of other keywords from within the same Ad Group? If anybody knows a guide that they'd recommend following re: Split Testing, I'd very much appreciate it. I feel it's imperative that Split Testing is used, as you are then always trying to better your listing. Regards, Muchacho.