This study extended the technology acceptance model and empirically tested the new model with wikis, a new type of educational technology. Based on social cognitive theory and the theory of planned behavior, three new variables, wiki self-efficacy, online posting anxiety, and perceived behavioral control, were added to the original technology acceptance model. A structural equation model was developed. Both qualitative and quantitative methods were conducted to test the structural model. The study found that wiki self-efficacy, perceived ease of use, perceived usefulness, and wiki use intention have direct and indirect significant impact on wiki usage in the classroom. (Contains 3 figures and 1 table.)