Usability Literature Review

Usability evaluation methods measure the probable effectiveness of a computer system or tool by looking at how learnable, efficient, memorable, safe, and satisfying it is for a given set of users.
With many of the tools that we use every day to accomplish our tasks and goalscomputers, wireless phones, Web pageswe communicate with complex computer systems. Because human beings don't speak in zeros and ones (binary code), and computers don't speak natural English, the software and the user must communicate via an intermediary--a layer of information that both user and system can interpret. We call this layer the "user interface." So when we are evaluating a computer system or application's usability, we are evaluating how well it communicates with and supports the functional needs of its target users.
Usable interfaces possess five basic attributes:
Learnability.--The system is easy to learn. Novice users are able to complete basic tasks in a short period of time, with a minimum of training.
Efficiency of use.--Experienced users are able to reach a steady state of productivity.
Memorability.--The system is easy to remember. Users can return to it after an absence and complete tasks without retraining.
Error Prevention.--Users experience few errors while using the system, and recover quickly from them.
Satisfaction.--The system is pleasant to use.

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