Rigid index

Soft index

Serious obstacle family

Borderline family

Intermediate family

Appropriate family

Best family

Centripetal family

The centripetal serious obstacle family

The centripetal borderline family

The centripetal intermediate family

Healthy family

Hybrid family

The hybrid intermediate family

Centrifugal family

The centrifugal serious obstacle family

The centrifugal borderline family

The centrifugal intermediate family