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Chair's letter
Ben Carterette

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ACM SIGIR annual business meeting 2021: secretary's notes
Claudia Hauff

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Game over?: a review of gamification in information retrieval
Alan Medlar | Dorota Glowacka

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A proposed conceptual framework for a representational approach to information retrieval
Jimmy Lin

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Report on the 4th international workshop on narrative extraction from texts (Text2Story 2021) at ECIR 2021
Ricardo Campos | Alípio M. Jorge | Adam Jatowt | Sumit Bhatia | Mark A. Finlayson | João Paulo Cordeiro | Conceição Rocha | Alexandre Ribeiro | Behrooz Mansouri | Jeffery Ansah | Arian Pasquali

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Report on the 11th international workshop on location and the web (LocWeb 2021) and the 11th temporal web analytics workshop (TempWeb2021) at WWW2021
Dirk Ahlers | Erik Wilde | Marc Spaniol | Ricardo Baeza-Yates | Omar Alonso

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Report on the 5th workshop on international and interdisciplinary perspectives on children & recommender and information retrieval systems (KidRec 2021) at IDC 2021: the teacher lens
Jerry Alan Fails | Monica Landoni | Theo Huibers | Maria Soledad Pera

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Report on the 44th international ACM SIGIR conference on research and development in information retrieval (SIGIR 2021)
Chirag Shah | Torsten Suel | Fernando Diaz | Bhaskar Mitra | Bárbara Poblete | Hussein Suleman | Suzan Verberne

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Report on women in IR (WIR 2021) at SIGIR 2021
Nazli Goharian | Hannah Bast

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Report on the 1st simulation for information retrieval workshop (Sim4IR 2021) at SIGIR 2021
Krisztian Balog | David Maxwell | Paul Thomas | Shuo Zhang

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Report on the 1st IR for children 2000-2020: where are we now? (IR4C) workshop at SIGIR 2021: the need to spotlight research on children information retrieval
Monica Landoni | Emiliana Murgia | Theo Huibers | Maria Soledad Pera

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Report on the SIGDial 2021 special session on summarization of dialogues and multi-party meetings (SummDial)
Tirthankar Ghosal | Muskaan Singh | Anja Nedoluzhko | Ondrej Bojar

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Report on the 1st linked archives international workshop (LinkedArchives 2021) at TPDL 2021
Carla Teixeira Lopes | Cristina Ribeiro | Franco Niccolucci | Irene Pimenta Rodrigues | Nuno Miguel Antunes Freire

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Report on the 2nd international conference on design of experimental search & information retrieval systems (DESIRES 2021)
Omar Alonso | Stefano Marchesin | Marc Najork | Gianmaria Silvello

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Report on the 12th conference and labs of the evaluation forum (CLEF 2021): experimental IR meets multilinguality, multimodality, and interaction
K. Selçuk Candan | Guglielmo Faggioli | Nicola Ferro | Lorraine Goeuriot | Bogdan Ionescu | Alexis Joly | Birger Larsen | Maria Maistro | Henning Müller | Florina Piroi

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Report on the 1st workshop on the perspectives on the evaluation of recommender systems (PERSPECTIVES 2021) at RecSys 2021
Eva Zangerle | Christine Bauer | Alan Said

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Report on the 3rd workshop of knowledge-aware and conversational recommender systems (KARS/ComplexRec) at RecSys 2021
Vito Walter Anelli | Pierpaolo Basile | Toine Bogers | Tommaso Di Noia | Francesco Maria Donini | Bamshad Mobasher | Cataldo Musto | Fedelucio Narducci | Casper Petersen | Maria Soledad Pera | Markus Zanker

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Report on the 1st workshop on recommender systems for human resources (RecSys in HR 2021) at RecSys 2021
David Graus | Toine Bogers | Mesut Kaya | Francisco Gutiérrez | Katrien Verbert

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Report on the 1st workshop on argumentation knowledge graphs (ArgKG 2021) at AKBC 2021
Tirthankar Ghosal | Khalid Al Khatib | Yufang Hou | Anita de Waard | Dayne Freitag

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Report on the 6th workshop on search-oriented conversational AI (SCAI 2021)
Svitlana Vakulenko | Ondrej Dusek | Leigh Clark

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Report on the 15th round of NII testbeds and community for information access research (NTCIR-15)
Makoto P. Kato | Yiqun Liu | Noriko Kando | Charles L. A. Clarke

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Conferences, journals, preprints, and reviewer expectations
Alistair Moffat | Joel Mackenzie

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Supporting search engines with knowledge and context
Nikos Voskarides

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Optimizing ranking systems online as bandits
Chang Li

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Proactive information retrieval
Procheta Sen

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Studies in aspects of peer review: novelty, scope, research lineage, review significance, and peer review outcome
Tirthankar Ghosal

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Improving search and recommendation by asking clarifying questions
Jie Zou