If there are multiple observers used in experimental design, it is especially important to:

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When there are multiple observers used in experimental design, it is important to operationally define variables and provide training to ensure that the observers are all measuring the same thing in the same way. This helps to minimize between-observer variability and increase the reliability of the measurements. Reducing within-subjects error, counterbalancing, and controlling the ecology of the design are also important considerations in experimental design, but are not as directly related to the use of multiple observers.

If There Are Multiple Observers Used in Experimental Design, It