Expert System - Australian Flags by McGoo Software

Based on the responses you have made:

The flag is probably the state flag of Victoria

Conclusion Notes:

The flag of Victoria is a British Blue Ensign defaced with the state badge. The badge depicts the Southern Cross surmounted by the St Edwards Crown. The stars in the Southern Cross range from five to eight points. As in Queensland, the design of the flag is changed in accordance with the style of Crown chosen by the reigning monarch, with the last such change occurring in 1953, after Queen Elizabeth II adopted the St Edwards Crown upon her Coronation in 1952.

Expert System Rule:

IF on the flag the Southern Cross is visible
AND on the flag there is a Union Jack present
AND the field of the flag is navy blue
AND above the Southern Cross there is a Crown
THEN the flag is probably the state flag of Victoria.

Calculated Certainty Factor: 0.48 = probably