Dear All. I am an Italian IDPA Shooter and an European S.O.
First of all please excuse me if my written english, is not so good.
In this discussion the answer, in my opinion, is very clear, if the s.o. at the breafing doesn't specify the order you can shoot from t1 to t3 or t3 to t1 (I mean from left to right or from right to left) with no problem. The only problem can be if there is a security problem. For ex if you start seated with gun in condition one and you have to withdrow the gun from your right side you have to shoot before to the right target, even if you could pass on your legs with the loaded gun (and this is really well written on the role book). In all the other situations, if is not specified, in my opinion, you can start from the side you prefer.
Thank you very much for your attention.
Antonio\Infinity001