One of my design goals with the 2D6 system is to keep the details to a minimum. Part of that involves streamlining the list of attributes. I have come up with a list of 3 broad attributes:
Might [M]: a measure of the character's physical strength and fatigue potential.
Prowess [P]: a measure of the character's balance, coordination, and reflexes.
Intellect [I]: a measure of the character's learning potential and reasoning ability.
I like the fact that the list is short and to the point. I am not 100% sure that only 3 attributes will serve the purposes of this system. I am unsure if I need to add another attribute that measures some form of mental toughness and stress resistance. I think that social attribute stuff can be handled with talents or advantage type stuff. I am designing outside of my comfort zone so I am sure it will take several attempts to get it right.
I am thinking that the race of the character will help determine the attribute ratings. I probably will not go with mechanical modifications to the initial scores that are rolled but something different. Maybe a roll of 2D6 for each attribute on a chart in the race description. This specific chart will be weighted to generate a rating in line with typical members of that race. For example, an elf might have a might generation chart that looks something like this:
3 to 8 -1
9 to 11 0
It is easy to see that the majority of elf characters will have either a -1 rating or average rating. Of course, selection of class/role/etc. could also change this rating in some manner also.