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Recommender systems are popular and powerful tools relying on this data to guide users to their individually best item choice. Literature suggests that data quality of item content data has substantial influence on recommendation quality. Thereby, the dimension completeness is expected to be particularly important. Herein resides a considerable chance to improve recommendation quality by increasing completeness via extending an item content data set with an additional data set of the same domain. This paper therefore proposes a procedure for such a systematic data extension and analyzes effects of the procedure regarding items, content and users based on real-world data sets from four leading web portals. The evaluation results suggest that the proposed procedure is indeed effective in enabling improved recommendation quality.<\/jats:p>","DOI":"10.1007\/s10796-020-10071-y","type":"journal-article","created":{"date-parts":[[2020,10,22]],"date-time":"2020-10-22T14:02:51Z","timestamp":1603375371000},"page":"267-286","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Something\u2019s Missing?\u00a0A Procedure for Extending Item Content Data Sets in the Context of Recommender Systems"],"prefix":"10.1007","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4193-0100","authenticated-orcid":false,"given":"Bernd","family":"Heinrich","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcus","family":"Hopf","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Lohninger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander","family":"Schiller","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Szubartowicz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,10,22]]},"reference":[{"key":"10071_CR1","doi-asserted-by":"publisher","first-page":"169","DOI":"10.1007\/s11257-012-9131-2","volume":"23","author":"F Abel","year":"2013","unstructured":"Abel, F., Herder, E., Houben, G.-J., Henze, N., & Krause, D. 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