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| doi = 10.1145/2487575.2488217
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* Robots, whether [[web crawlers]] from valid sources or malicious [[internet bots]].{{clarify|reason=what about them? do they affect the reliability of the results?|date=May 2019}}
* Ability to ramp-up experiments from low percentages to higher percentages.
* Speed / performance has significant impact on key metrics.<ref name="surveyarticle" /><ref name="ExPRulesOfThumb">
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