We are happy to announce the contents of 

++  Volume 99 of the Information Systems Journal  ++

Ishaq Zouaghi, Amin Mesmoudi, Jorge Galicia, Ladjel Bellatreche, Taoufik Aguili
GoFast: Graph-based optimization for efficient and scalable query evaluation
Information Systems, Volume 99, 2021, 101738, ISSN 0306-4379

Vangelis Sarlis, Vasilis Chatziilias, Christos Tjortjis, Dimitris Mandalidis
A Data Science approach analysing the Impact of Injuries on Basketball Player and Team Performance
Information Systems, Volume 99, 2021, 101750, ISSN 0306-4379

Giulio Ermanno Pibiri, Shunsuke Kanda
Rank/select queries over mutable bitmaps
Information Systems, Volume 99, 2021, 101756, ISSN 0306-4379

Alvaro Valencia-Parra, Angel Jesus Varela-Vaca, Maria Teresa Gomez-Lopez, Josep Carmona, Robin Bergenthum
Empowering conformance checking using Big Data through horizontal decomposition
Information Systems, Volume 99, 2021, 101731, ISSN 0306-4379

Chin-Hui Lai, Chia-Yu Hsu
Rating prediction based on combination of review mining and user preference analysis
Information Systems, Volume 99, 2021, 101742, ISSN 0306-4379

Reem Alharthi, Areej Alhothali, Kawthar Moria 
A real-time deep-learning approach for filtering Arabic low-quality content and accounts on Twitter
Information Systems, Volume 99, 2021, 101740, ISSN 0306-4379

Dennis Shasha, Gottfried Vossen, Matthias Weidlich