0Principle:Writing down the standard Major scale pattern where Upper case Roman numerals denote the Major Chords and lower case roman numerals denote the minor chords and viiiois the Dim 7th Chord.
I ii iii IV V vi viiio
| Chords | Chord Names |
| I Major | Tonic |
| ii minor | Super-tonic |
| iii minor | Mediant |
| IV Major | Sub-dominant |
| V Major | Dominant |
| vi minor | Sub-mediant |
| viiiodim7 | Leading tone |
