Any ontological theory commits us to accept and classify a number of phenomena in a more or less specific way – and vice versa: a classification tends to reveal the theoretical outlook of its creator. Objects and their descriptions and relations are not just “given” but determined by theories. Knowledge is fallible and consensus is rare. By implication, knowledge organization has to consider di...

The Simple Knowledge Organization System (SKOS) is a standard model for controlled vocabularies on the Web. However, SKOS vocabularies often differ in terms of quality, which reduces their applicability across system boundaries. Here we investigate how we can support taxonomists in improving SKOS vocabularies by pointing out quality issues that go beyond the integrity constraints defined in the...