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Need an research paper on usability tests and heuristic evaluations in assessing prototypes of interface designs. Needs to be 13 pages. Please no plagiarism. Effectiveness is described as the degree of consistency that a product will behave as expected. It is also the measure the degree of ease users experience in using the product. Learnability refers to the ability of the user to operate the system with a definite degree of competence after a certain amount of training. It also refers to likelihood that users who have not used the system for a period of time will be able to relearn how to operate it. Satisfaction includes a user’s feelings, perceptions, and opinion about the system. Information is usually collected through written and oral means (Rubin &amp. Chisnell 2008). Finally, accessibility involves the capability of the system to allow persons with disabilities to perceive, understand, navigate, and interact with it. In performing usability tests, two basic principles should always be remembered: (1) a designer’s perception on the system design is different from the target audience. and (2) it is better to conduct multiple tests with a few users rather than running a single test with a large number of users. Usability tests usually involve either getting an audience evaluation of the system or having a usability design expert perform a heuristic evaluation of the program. One drawback of heuristic evaluation is that the expert reviewer may not share the same perception as the target users or may identify errors that target users do not consider as problems.

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