Kata dori is in my opinion one of the most modern attacks in Aikido and perhaps helps to deliniate Aikido as gendai budo rather than a true Koryu style.
Chiba Sensei always used to apply a pushing or pulling force during kata-dori - often combined with a blow or kick.
This stood me in good stead during my (brief) time as a door supervisor at a nightclub, when I realised this was actually quite a common attack; often used to intimidate the victim.
Thanks, Philip. Did Chiba Sensei call for a "grab a handful of dogi" attack or was it grabbing the meat of the shoulder?