Table 6. Maintainability ranges of source code according to different formulas for the MI metric.

Variant	Low maintainability	Medium maintainability	High maintainability
Original	MI < 65	65 < MI < 85	MI > 85
SEI	MI < 65	65 < MI < 85	MI > 85
VS	MI < 10	10 < MI < 20	MI > 20