A method for contextual computer-based instruction concerning a discipline. Information-units that are relevant to the discipline are stored in a computer that includes interactive user-interface software. The user-interface software accepts at least one input data set having a data-type. Data sets are rendered as iconic representations with which the user interacts and can select one or more representations. In response to the selection of one or more iconic representations, the software establishes a selectable list of user-operations available through the software and further enables one of the information units for user-selection through the software on the basis of the currently selected iconic representation. The particular information unit enabled can provide contextually-sensitive information regarding the selected iconic representation. The software can further generate additional iconic representations that are associated with a user-selected iconic representation based on any user-selected operation performed on the user-selected data set.