用不着，无论使用正式的或非正式的设备你都可以做可用性测试。
No. You can do usability testing in either a formal or informal setting.
使用Web 2.0群众外包(CrowdSourcing)模型以极大的降低可用性测试的价格。
USES the Web 2.0 crowdsourcing model to dramatically drop the price of usability testing.
使用扩展函数，用xsl： choose测试保证函数的可用性。
Use of an extension function, guarded by XSL: choose testing for availability of the function.
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