Abstract: A modularized computer-aided language learning system utilizing a unique user interface and modularized presentation modules to assist users to learn a language. The system presents a presentation module including a first description of a presentation subject and a placeholder indicating that a second description of the presentation subject is missing from the presentation module. Each of the first description of the presentation subject and the second description of the presentation subject is one of a textual type, a visual type and an audio type. Separated from the presentation module, the system presents the second description of the presentation subject, and receives a user input indicating an association of the presented second description to presentation module related to the presentation subject. Feedback is provided indicating the correctness of the association. The disclosure also describes a unique program design approach to form training programs using the presentation modules.