The purposes of this study were to set up web-based resources of STS teaching and to investigate the feasibility of an evaluation system for evaluating science teaching. The web-based resource were developed from the viewpoint of STS teaching, which includes STS teaching modules and referable instructional contents. Fuzzy-set theories are applied to develop the self-evaluation system for teaching. The results of the study describe the features of and rationale behind the web-based resources and also show the feasibility of the evaluation system for teaching.