Intervals list

Ciao. I'm working with a friend on a software for guitar and I need a
list of the intervals in 12-ET from the more consonant to more
dissonant. With "consonant" I mean beatless, empty. So I've tried to do
my own list based only upon my ear:

octave
P5
P4
6M
3M
3m
6m
7m
4+
2M
7M
2m

This list is istinctive but I'd like to have a more scientific
justification if possible. Anyone can help me? Maybe with a mathematic
law on beating and interval spacing (spacing: 10M is more consonant
than 3M). Ciao.

-Lorenzo

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