Sumario: | It is our great pleasure to welcome you to the third annual Lifelog Search Challenge - LSC'20-held during the ACM ICMR'20 conference in Dublin, Ireland.Motivated by the success of the first two LSC workshops and driven by the fact that lifelog organisation and retrieval continue to pose significant challenges for the research community, we are organising the third in the series of LSC workshops. The mission of the LSC workshops is to support the development and comparative evaluation of interactive lifelog retrieval systems by releasing test collections and defining research challenges to be solved by the community in an open and collaborative manner. The LSC workshops are participation workshops, where participants write and present an academic paper describing their retrieval system, and then take part in a live interactive search competition. Consequently, the workshop is highly interactive and challenging for participants. LSC'20 starts with short oral presentations of participating systems, followed by the search challenge which involves both expert users in a private session and novice users in a public session, which never fails to excite.The call for papers attracted submissions from Asia and Europe and ultimately fourteen papers have been selected for inclusion in the program, with authors from Ireland, Austria, China, Czech Republic, Denmark, Japan, Netherlands, Slovakia, Switzerland, Taiwan and Vietnam. Each of these papers is accompanied by a working interactive search engine. The organisers are delighted to see such a strong community building around the Lifelog Search Challenge.
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