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Discourse is key to knowledge construction. This case study investigated types of online discourse that contribute to developing “knowledge of promisingness”—an indicator of knowledge advancement—in an online knowledge-building environment. Thirty-two in-service teachers from a master’s degree program engaged in online discourse to develop their thesis proposal ideas. The study identified three main types of discourse as sharing-, arguing-, and improving-oriented. The main findings suggest: sharing- and arguing-oriented discourse is necessary (but not sufficient) for promoting knowledge of promisingness; and the more effort devoted to engaging in improving-oriented discourse, the more likely the participants were to develop knowledge of promisingness for knowledge creation.