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This section includes different concepts and definitions of Usability testing from Software point of view. It is a black box technique and is used to identify any error(s) and improvements in the Software by observing the users through their usage and operation. According to Nielsen, Usability can be defined in terms of five factors i.e. Efficiency of use, Learn-ability, Memor-ability, Errors/safety, satisfaction. According to him the usability of the product will be good and the system is usable if it possesses the above factors. Nigel Bevan and Macleod considered that Usability is the quality requirement which can be measured as the outcome of interactions with a computer system. This requirement can be fulfilled and the end user will be satisfied if the intended goals are achieved effectively with the use of proper resources. Molich in 2000 stated that user friendly system should fulfill the following five goals i.e. Easy to Learn, Easy to Remember, Efficient to Use, Satisfactory to Use and Easy to Understand. In addition to different definitions of usability, there are some standards and quality models and methods which define the usability in the form of attributes and sub attributes such as ISO-9126, ISO-9241-11, ISO-13407 and IEEE std.610.12 etc.

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