Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Systems maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 21 days and the median time to publication was 43 days. The editors would like to express their sincere gratitude to the following reviewers for their precious time and dedication, regardless of whether the papers were finally published:
| Abreu, António | Coelho, Denis A. |
| Ackermann, Fran | Dabija, Dan-Cristian |
| Adriaensen, Arie | Davidescu, Adriana Ana Maria |
| Albusac, Javier | Davidz, Heidi |
| Alcarria, Ramón | De Boer, Luitzen |
| Alonso Chavez, Vasthi | De Oliveira, Leise Kelli |
| Al-Shibaany, Zeyad | De Santo, Natale G. |
| Andries, Mihai | Delcea, Camelia |
| Antonovsky, Ari | Dieber, Bernhard |
| Aragoneses, Andrés | Dillon-Merrill, Robin L. |
| Armstrong, Stuart | Dolfin, Marina |
| Azouani, Abderrahim | Dumitriu, Dan |
| Balchanos, Michael | Dziechciarz, Józef |
| Banias, Ovidiu | Edwards, Stephen |
| Barba-Sánchez, Virginia | Elshaw, John J. |
| Bastas, Ali | Esangbedo, Moses Olabhele |
| Bellos, Evangelos | Espejo, Raul |
| Berg, Christian | Fan, Yee-Van |
| Bernier, Andrew | Farina, Alessandro |
| Blanco Rivero, Jose Javier | Febres, Gerardo |
| Blašková, Martina | Fekete, Alexander |
| Bolbot, Victor | Fernández, Julio Blanco |
| Brack, André | Ferrario, Roberta |
| Buckle, Pamela | Fokkink, Robbert |
| Bukowski, Lech | Freeze, Ronald |
| Calvo-Amodio, Javier | Freire, André Pimenta |
| Camerino, Oleguer | Froelich, Wojciech |
| Carmona, Pedro | Futia, Giuseppe |
| Cerezo-Narváez, Alberto | Gao, Feng |
| Chai, Ching Sing | Ge, Yingchun |
| Chang, Soowon | Ghosh, Ruchira |
| Cherif, Alhaji | Gluhih, Igor |
| Chiacchio, Ferdinando | Gralla, Erica |
| Christoforou, Zoi | Grosso, Massimiliano |
| Chudzicki, Jarosław | Guarnieri, Patricia |
| Guliciuc, Viorel | Miller, Michael E. |
| Habron, Geoffrey | Mittal, Sudip |
| Hagen-Zanker, Alex | Monat, Jamie |
| Hajej, Zied | Moreno Molina, David |
| Hakovirta, Marko | Mulej, Matjaz |
| Haluza, Daniela | Muller, Gerrit |
| Haverila, Matti | Müller, Julian Marius |
| Helman, Joanna | Nadányiová, Margaréta |
| Hosseinian-Far, Amin | Napoli, Christian |
| Huet, Sylvie | Nepomuceno, Erivelton Geraldo |
| Igamberdiev, Abir U. | Neureiter, Christian |
| Ilias, Sakellariou | Nieto, Juan |
| Jagoda, Agnieszka | Nowaczyk, Sławomir |
| Jbara, Ahmad | Oh, Inha |
| Jenlink, Patrick M. | Onyango, Esther |
| Jensen, Olga | Ordóñez, Isabel |
| Jeong, Byung Yong | Pacana, Andrzej |
| Jones, Katherine | Park, Sungkyu Shaun |
| Kanoi, Bernard | Pastusiak, Tadeusz |
| Kersten, Wouter C. | Pchelintsev, Alexander |
| Khashanah, Khaldoun | Pericchi, Luis |
| Khayal, Inas S. | Peter, Jones |
| Khedmati Morasae, Esmaeil | Petroutsatou, Kleopatra |
| Kianmehr, Hamed | Po, Laura |
| Kierzkowski, Artur | Popescu, Gheorghe N. |
| Kim, Hyunjung | Popkov, Yuri S. |
| Kirby, Andrew | Potyrała, Katarzyna |
| Kirpich, Alexander | Presta, Roberta |
| Koral Kordova, Sigal | Prieto-Gutiérrez, Juan José |
| Kordonis, Ioannis | Pross, Addy |
| Korfiatis, Constantinos | Pullan, Jerry |
| Krajcovic, Martin | Raffensperger, John F. |
| Krajcsák, Zoltán | Ranky, Paul |
| Krejcar, Ondrej | Raz, Ali K. |
| Kyung, Gyouhyung | Reboiro, Marta |
| Labaka, Leire | Reynolds, Martin |
| Lane, Andy | Rich, Eliot |
| Lepkova, Natalija | Rodríguez-López, Nuria |
| Leuzzi, Fabio | Roscia, Mariacristina |
| Licata, Ignazio | Rousseau, David |
| Lin, Zhongwei | Ruiz-Sinoga, José Damián |
| Lloret, Antonio | Salim, Hengky |
| Lugnet, Johan | Salmas, Constantinos |
| Ma, Zheng Feei | Salvador-García, Celina |
| Makowski, Marcin | Samat, Alim |
| Manione, Roberto | Sanchez Ramírez, Cuauhtémoc |
| Mao, Xiaoguang | Santos, Gilberto |
| Marolt, Marjeta | Savanevičienė, Asta |
| Marović, Ivan | Schaum, Alexander |
| Merritt, Joi | Schiappacasse, Paulina |
| Michnik, Jerzy | Sheu, Guang Yih |
| Shimomura, Yoshiki | Van Driel, Willem |
| Silva, Bhagya Nathali | Vanderelst, Dieter |
| Silva, Carlos | Vasilache, Simona |
| Simaens, Ana | Vaughn-Cooke, Monifa |
| Smith, Michael C. | Vicino, Thomas |
| Speir, Cameron | Voyer, John |
| Stano, Pasquale | Wade, Eric |
| Stará, Jana | Wang, Wei |
| Steenhuis, Tammo | Watson, Richard |
| Stojić, Andreja | Wells, Sam |
| Tang, Yongchuan | Xue, Qing |
| Tchórzewska-Cieślak, Barbara | Yeh, Tsu-Ming |
| Tiberius, Victor | Zambrana, Ivis Garcia |
| Trailer, Jeff | Zarri, Gian Piero |
| Tsalis, Thomas | Zhao, Jinsong |
| Uday, Payuna | Zhu, Bo-Wei |
| Ugarte, Juan P. | Zimmer, J. Christopher |
| Useche, Sergio A. | Zimmermann, Rainer |
| Vafadarnikjoo, Amin | Zorrilla, Vanessa |
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