A feedback loop for the assessment of a user interface of a communications network is based on feature units for analysis and comparison. These units are subset collections that are grouped together to perform a particular task or function. When, these units can be objectively and quantitatively assessed, and compared among various user interfaces. The quantification, assessment, market testing and comparison informs the feedback loop to reveal ways in which a user interface can be improved so as to benefit a company's ability to effectively communicate with its customers. A Constant Sum Scale question is used to support the comparison among user interface features, and is also applicable in a wide variety of contexts.