This article introduces two studies showing the perceived usefulness reported by the participants of Intranet Based Learning (IBL) (N = 226) and the effectiveness of IBL measured by the outcomes of two instructional groups and the control group in a Korean private company (N = 132). It is suggested that additional aspects of IBL need to be considered when instructional trainers design asynchronous knowledge management systems. Implications for utilizing IBL are further provided. (Contains 1 figure and 1 table.)