I'm at a relatively early stage of my training - bluebelt (though with all the styles and varying teaching levels out there that doesn't mean much) but already I've started learning a series of drills where Tai Sabaki (evasion) is used. The mail drill I'm thinking of is quite straightforward -- the kogeki (attacker) attacks in a straight line with prearranged attacks, and the uki (defender) then blocks directly first of all, and then steps 45 degrees away for the following two moves. This is done in zenkutsu dachi, nekoashi dachi and then sanchin dachi (I dare say there are more versions which I've not yet seen). Hope this is some help. (Oh, incase you're interested I'm studying Kusano Ha ****oryu. Its funky