Minimum standard - SML1
Expected standard - SML3
Excellent standard - SML5
SML1 - Initial usability: Internationalisation and Localisation are not addressed.
SML2 - Use is feasible: Software is locale aware (i.e. locale can be set and changed).
SML3 - Use is possible by most users: All text to localise has been internationalised.
SML4 - Software is usable: All content to localise (other than text) has been internationalised.
SML5 - Demonstrable usability: Software has been tested with multiple locales.