  Linked Open Data (LOD) is the publicly available RDF data in the Web. Each
LOD entity is identfied by a URI and accessible via HTTP. LOD encodes
globalscale knowledge potentially available to any human as well as artificial
intelligence that may want to benefit from it as background knowledge for
supporting their tasks. LOD has emerged as the backbone of applications in
diverse fields such as Natural Language Processing, Information Retrieval,
Computer Vision, Speech Recognition, and many more. Nevertheless, regardless of
the specific tasks that LOD-based tools aim to address, the reuse of such
knowledge may be challenging for diverse reasons, e.g. semantic heterogeneity,
provenance, and data quality. As aptly stated by Heath et al. Linked Data might
be outdated, imprecise, or simply wrong": there arouses a necessity to
investigate the problem of linked data validity. This work reports a
collaborative effort performed by nine teams of students, guided by an equal
number of senior researchers, attending the International Semantic Web Research
School (ISWS 2018) towards addressing such investigation from different
perspectives coupled with different approaches to tackle the issue.
