Expert System - Australian Flags by McGoo Software

Based on the responses you have made:

The flag is probably the Christmas Island Flag

Conclusion Notes:

The flag of Christmas Island was unofficially adopted in 1986 after being chosen the winner in a competition for a flag for the territory. It was designed by Tony Couch of Sydney, Australia. The flag was made official on Australia Day, 2002 when the administrator of the territory, Bill Taylor, presented the flag to the Christmas Island Shire.The flag of Christmas Island was unofficially adopted in 1986 after being chosen the winner in a competition for a flag for the territory. It was designed by Tony Couch of Sydney, Australia. The flag was made official on Australia Day, 2002 when the administrator of the territory, Bill Taylor, presented the flag to the Christmas Island Shire.

Expert System Rule:

IF on the flag the Southern Cross is visible
AND on the flag there is no Union Jack present
AND the field of the flag is blue and green
THEN the flag is probably the Christmas Island Flag.

Calculated Certainty Factor: 0.70 = probably