ocr: Hammer DeRoburt, Head Chief ofNauru, be came the island's first president in 1968.He dominated - the political structure until a vote ofno contidence forced him to resign in 1989.He was replacedby Dowiyogo, who secured. his continued term in office in the 1992 elections. The traditional chiefs are still the dominant political figures. Nauru's Parliament is based on the British Westminster model. Members often switch between temporary, unstable groupings within it.