Gian-Marco Schmid investigates how musicians perceive the experiential quality of musical instruments using a bottom-up psychometric questionnaire development process and finds that there are three main factors on which musicians base their evaluation of musical instruments: (1) experienced freedom & possibilities, (2) perceived control & comfort and (3) perceived stability, sound quality & aesthetics. This structure is similar to research regarding the conceptualization of violin quality. It is therefore suggested that musicians who use different instruments tend to have an analogical concept of instrument quality. Contents Evaluation in the Domain of New Interfaces for Musical Expression Interviews with Musicians and Item Generation Refinement and Reduction of the Item Pool Target Groups Lecturers, students and practitioners in the field of Human-Computer Interaction, Music & HCI, Cognitive Psychology, Music Psychology and Musicology The Author Gian-Marco Schmid focuses his research on the interdisciplinary intersection between Music and Human-Computer Interaction. His main research interests reach from Psychometrics to Psychophysics.