Coherence evaluation of input vocabularies to enhance usability and user experience

Abstract

What is and to what end do we study coherence of an input vocabulary? How can we quantify this attribute? We define the term coherence of an input vocabulary (e.g., for gesture interaction) based on mental models associated with its entries and explain how coherence can support intuitive interaction. We define mean coherence score as an indirect measure based on guessability of vocabulary entries. As a demonstration, we report the results of a user study in which we applied the suggested method to measure coherence of five gesture input vocabularies for Unmanned Aerial Vehicle navigation. Then, we discuss the obtained results and distinguish the flaw and key vocabulary entries for a deeper understanding of the input vocabularies.