Pythagoras taught that each number had its own peculiar character, virtues, and properties. Anywhere in this cosmos, the Circle, Triangle, Square, Hexagon, and so on remain the same unchanging archetypes. Numbers that are so important in measuring and managing Usability related aspects in Software design also convey some the qualitativeness which is often missed out. This half - day workshop attempts to blend the Qualitative and Quantitative approaches in the User - Centered Design in a manner where mathematics blends with the associated subjectivities seamlessly. As such the Usability Methods have been sparingly used due to the innate qualitative aspects. This half-day workshop is to enable the designers to read the qualitative aspects hidden behind the seemingly manageable quantitative measures. Without deviating from the "Goal - Question - Metric Methods" based methods, it is possible to derive the qualitative and subjective aspects. Some Usability methods may be deployed to substantiate critical aspects in design identified using the above approaches. The method is based on possible use of "Qualitative Number Theory" and promises to be a seamless blend with the quantitative methods of design. Good Interaction Design = Unification of Numbers and Symbols.