Researchers must take into account their own biases and a study's unintended impact on subjects' usual behavior, discussion help

Discussion Board Help:Week 2- Discussion-The Topic 2 Lecture states that, "Researchers must take into account their own biases and a study's unintended impact on subjects' usual behavior." To address these issues, it says researchers have to use multiple research approaches, as well as single-blind and double-blind conditions. Do you feel these methods are sufficient to make sure a study is not biased and is conducted in a valid manner? Explain your rationale.