Priority is how much the program considers a given question in determining your score. For example, On the Yoshi quiz, For the "I am generally very shy" question, It all depends on the situation. I said "No", but put "Low" priority due to the fact that I am not truly behind that answer. It doesn't figure much into your scoring then.
For the "I am not comfortable showing weakness." question, I said "Yes" (I.E., I am NOT comfortable with it. At all.) and put down "High" priority, because it is one of my strict beliefs that if you show weakness, any weakness at all, someone else will exploit it to the point which they become SUPERIOR to you. And that is The Ultimate Insult. (Notice I capitalize "Ultimate Insult".) Thus, that question is scored more when it determines your score.
I hope that clears it up.
(PS: My true personality, if you consider all the possible outcomes and blending of them, is:
1 part Black
1 part Orange
1 part every color but Green.
That is according to me though...)
You know what? I got really, really bored one day so I decided to change my signature.