If product designers and engineers are available, encourage them to watch the tests, but prevent them from interacting with the users so that they do not influence the test results.
如果可能的话，让设计人员和工程师也能够观察测试，但是不要让他们和用户交流，以免影响测试的结果。
If product designers and engineers are available, encourage them to watch the tests, but prevent them from interacting with the users so that they do not influence the test results.
如果可能的话，让设计人员和工程师也能够观察测试，但是不要让他们和用户交流，以免影响测试的结果。
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