This paper presents the results of a case study involving 282 Taiwanese elementary science teachers at the elementary level. These teachers provided responses to the science efficacy instrument (STEBI-A) and also provided personal data regarding how their years of general (YTE) and science (YTS) teaching experience may have influenced student achievement in science. Researchers used two multivariate analysis of variance (MANOVA) to investigate the interaction and influence of YTE and YTS upon the personal science teaching efficacy (PSTE) and science teaching outcome expectations (STOE) of these teachers. The results advocate the position that the years of general teaching experience of elementary science teachers in Taiwan have a significantly greater impact upon their personal science teaching efficacy and science teaching outcome expectations than years of teaching science. This evidence calls into question whether Bandura and Tschannen-Moran's view of teacher efficacy as both context and subject matter specific at the elementary level can be applied to Taiwan elementary teachers who teach science. The results of this study should benefit educators and policy-makers with respect to future elementary teacher education throughout Taiwan and other developing nations.