A Product Oriented Approach to Quantify Usability Attributes and the Interactive Quality of User Interfaces

Four different measures based on a product oriented view of user interfaces are introduced. Different types of user interfaces can be described and differentiated by the powerful concept of "interaction points". Regarding to the interactive semantic of "interaction points" (FIPs), 4 different types of FIPs must be discriminated. Based on the concept of interaction points, the dimensions "feedback", "interactive directness" and "flexibility" can be quantified. The results of a theoretical and an empirical validation of 4 quantitative measures are presented and discussed.