They more outlined a design through which mood is intended to affect perception, evaluation, and cognitive work resulting in variable levels of IS usage behavior. While this model is not tested, It's a beneficial framework from which to analyze emotion empirically. No, usability and usefulness are unique concepts in design. https://sergiosbho30630.timeblog.net/67734934/why-partnering-with-an-austin-seo-firm-is-essential-for-business-growth