I'm with Jay on this one. Fibonnaci numbers work well for sorting out the relative effort of a story - you don't have an argument about whether it is a 5 or a 6, instead it's a question of "is it a 5 or an 8?".
One way to start is to select a user story that the team is fairly confident about how much effort is involved. Estimate this using fibonnaci and call it a 3 or a 5, for instance, then you can proceed with estimating other stories using that issue as an indication.
We use the somewhat typical X-small, Small, Medium, Large, X-Large, ??? approach during the estimation game. Then I translate that to 2,4,8,16,32. 32 is too big for us to get into a sprint, we do 1 week sprints, so we break it down. 16 we usually break down as well. Anything over 32 is an epic and needs to be broken down.
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