I teach my children: "Nothing that is real is perfect and nothing that is perfect is real." Then I do Plato's Allegory of the Cave to explain Realism vs Idealis

I teach my children: "Nothing that is real is perfect and nothing that is perfect is real." Then I do Plato's Allegory of the Cave to explain Realism vs Idealism. IT systems exist to be practical, so "good enough for a given purpose" is sufficient, they do not need to perfectly caputure every aspect of reality. For the same reason, it does not make sense to expect "Data Quality" of any IT system to be perfect or even "good enough" when you the data is transferred to another system (or is to be used for a different purpose) where other aspects of the data determine if the data is "good enough". This even applies to the metadata. Ontology and Semantics will depend on what the purpose of an IT system is, as well as what data is available. If the same data is to be used for another purpose, you may need to apply different metadata to it.