Answer to Question 1
UserIssues related to experience, skills, motivation, education, and personality should be considered.
TaskTasks differ in amount of information that must be obtained from or provided to the user. Task demands such as time pressure, cost of errors, and work duration (fatigue) will influence usability.
SystemThe platform on which the system is constructed will influence interaction styles and devices.
EnvironmentSocial issues such as the users' status and role should be considered in addition to environmental concerns such as lighting, sound, task interruptions, temperature, and humidity. The creation of usable forms and reports may necessitate changes in the users' physical work facilities.
Answer to Question 2
LearnabilityHow difficult is it for a user to perform a task for the first time?
EfficiencyHow quickly can users perform tasks once they know how to perform them?
Error rateHow many errors might a user encounter, and how easy it is to recover from those errors?
MemorabilityHow easy is it to remember how to accomplish a task when revisiting the system after some period of time?
Satisfaction and aestheticsHow enjoyable is the system's visual appeal and how enjoyable is it to use?
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