The IBM Task Modeler supports the rapid creation and analysis of hierarchical task models, thereby providing a valuable and naturally visual tool for information architects. Task Modeler not only facilitates the essential processes of design, validation, and modification but also enables an information architect to develop and apply schemes for information classification. Categories and Subject Descriptors H.5.2 [Information Interfaces and Presentation (e.g., HCI)]: User Interfaces - Graphical user interfaces (GUI), Interaction styles. D.2.10 [Software Engineering]: Design Tools and Techniques - Evolutionary prototyping. General Terms Documentation, Design, Experimentation, Human Factors. Keywords Modelling, Task Analysis, DITA, Visualization.