This book constitutes the refereed proceedings of the 9 th International Conference of the CLEF
Initiative CLEF 2018 jointly organized by Avignon Marseille and Toulon universities and held
in Avignon France in September 2018. The conference has a clear focus on experimental
information retrieval with special attention to the challenges of multimodality
multilinguality and interactive search ranging from unstructured to semi structures and
structured data. The 13 papers presented in this volume were carefully reviewed and selected
from 39 submissions. Many papers tackle the medical ehealth and ehealth multimedia retrieval
challenges however there are many other topics of research such as document clustering social
biases in IR social book search personality profiling. Further this volume presents 9 best of
the labs papers which were reviewed as a full paper submission with the same review criteria.
The labs represented scientific challenges based on new data sets and real world problems in
multimodal and multilingual information access. In addition to this 10 benchmarking labs
reported results of their yearlong activities in overview talks and lab sessions. The papers
address all aspects of information access in any modularity and language and cover a broad
range of topics in the field of multilingual and multimodal information access evaluation.
