Expert Opinion

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However, the VM requires an holistic approach ...

A holistic approach is certainly good, but this is where detailed questions often arise that the researcher can no longer answer themselves. In such cases, the opinions of experts who are well versed in a particular field are certainly helpful. However, it is difficult to objectively assess the quality of the opinions of individual experts, as they are not on the same thematic level. Ideally, there should be several experts in the field in question so that the statements can be compared.