How do you decide what attributes to include in your rpg?

[Octopusapult]

I'm curious as to why you equated Agility to move speed and not Strength.

Why not? I don't see how strength might govern movement speed over agility.

It would really depend on what I was making. However most of the times I have thought and sketched attributes I tend to go with a skill/feats system. One of the reasons I like 5th so much is that it is very similar to the sort of things I would build: Broad category skills, Game defining feats, Backgrounds to give a base for defining your character in role and roll play.

Agreed about most things. Backgrounds I can live without, but broad category skills are good.