We are currently debating on how to layout this form. I prefer the way it is layed out currently, with the radio buttons being positioned vertically. Those in power prefer them to be layed out horizontally, which I do not have an image of, but which I believe does not make sense.
Here is an image of the form with vertical layout: http://img95.imageshack.us/img95/5757/tradeevalform2tg0.jpg
Their argument is that having them layed out horizontally is better because It reduces the length of the form, which means less scrolling for the user.
I believe that having the radio buttons layed out vertically is superior because the reader's eyes can move directly down the form uninterrupted. It also looks much better. It is also easier to fill out because the radio buttons are all aligned with each other.
Having the radio buttons horizontal breaks the flow of the rest of the form. It looks bad because the radio buttons are not aligned. I do not like it, but I am outnumbered here.
What I am looking for is a definitive answer of which way is more correct. Links to articles, or at least some sound reasoning why one way is more correct, or has more advantages to the other would be greatly appreciated.
Thanks very much