DCS 208: Human Computer Interaction. Instruction: Answer ALL Questions. 1. Define Usability. 2. Briefly explain the four major components of usability. 3. What are the four factors that should be considered when looking at the major components of usability?

Usability refers to the ease of use and learnability of a human-made object, such as a software application, website, or device. It measures how effectively, efficiently, and satisfactorily users can achieve specific goals when interacting with a system.

I. Learnability: This component describes how easy it is for new users to accomplish basic tasks the first time they encounter the system.
II. Efficiency: This refers to how quickly experienced users can perform tasks once they have learned the system.
III. Memorability: This component measures how easily users can re-establish proficiency with the system after a period of not using it.
IV. Error Prevention & Recovery: This relates to how well the system prevents users from making errors and how easily users can recover from errors when they do occur.

The four major factors (or components) of usability are:
I. Learnability
II. Efficiency
III. Memorability
IV. Error Prevention & Recovery