The main purpose of the four-nation swing was for Premier Chang to represent President Chen Shui-bian in attending celebrations of the 20th anniversary of the establishment of diplomatic relations between the ROC and St. Vincent.
行政院長張俊雄的聖克里斯多福、聖文森、多米尼克及格瑞那達等四國之行，主要是以陳水扁總統特使的身分參加聖文森與中華民國建交二十周年慶典，出訪行程過境美國紐約、洛杉磯與夏威夷。