Objectivity is an important criterion during data ascertainment. Basically, it means that a method of data collection must always come to the same result, regardless of who ascertains the data. So whether interviewer A or interview B conducts a survey should not make any difference. Similarly, when conducting an observation, the documentation must be carried out in the same fashion by all parties; the same goes for the execution and management of an experiment.
Please note that the definitions in our statistics encyclopedia are simplified explanations of terms. Our goal is to make the definitions accessible for a broad audience; thus it is possible that some definitions do not adhere entirely to scientific standards.