Evaluating the Usability of Information Systems

NASA’s budget has decreased and information systems (IS) technology entails committing millions of dollars so the usability success and return on investment (ROI) have a direct impact on the NASA budget. Two strong determinants of successful information systems are usability and the user’s continuance intention. A quantitative methodology design utilizing the System Usability Scale (SUS) was used in this study to measure satisfaction indicating the existence of usability and a post acceptance tool which determines continuance intention indicating systems’ usability. The Likert-type scale survey was given to 114 participants working on a NASA payload integration contract in the management engineering and operations areas. Structural equation modeling tested the five hypotheses and determined if there was a relationship between perceived usefulness confirmation satisfaction and continuance intention. The expectation–confirmation theory (ECT) and the continuance intention model using structural equation modeling (SEM) quantitatively measured if there was a relationship between perceived usefulness confirmation satisfaction and continuance intention.