“…The operational definition of usability, that is, the heuristic evaluation framework of usability by Nielsen dominates (Gray & Salzman, 1998). This definition includes visibility of system status, match between the system and the real world, user control and freedom, consistency and standards, error prevention, recognition rather than recall, flexibility and efficiency of use, aesthetic and minimalist design, and helping users recognize, diagnose, and recover from errors (Nielsen, 1994a). Nielsen (1994b) further grouped the framework into five usability goals: learnability, efficiency, memorability, errors (as in low error rate), and satisfaction.…”