Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Systems was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 16 days and the median time to publication was 44 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Adrian Korodi | Liang-Bi Chen |
| Adrian Tantau | Lingbo Liu |
| Agata Mesjasz-Lech | Livia Anastasiu |
| Ahmad Ali | Long Wang |
| Aijun Liu | Ludovic Apvrille |
| Alejandro Padilla-Rivera | Luis Matosas-López |
| Alejandro Salado | Luitzen De Boer |
| Aleksander Buczacki | Maider Aldaz |
| Alessandro Giuliani | Manuel García García |
| Alfredo Coelho | Manuel Pabón-Carrasco |
| Ali Reza Yarahmadi Bafghi | Manuela Ingaldi |
| Amir Mahdiyar | Marcel Pikhart |
| Ana Cristina Sayuri Tanaka | Marco Cucchi |
| Ana Simaens | Marcos Pereira Estellita Lins |
| Anca Sipos | Mare Koit |
| Andrea Mariscotti | María Del Mar Fernández Martínez |
| Andreas Größler | Maria Francesca Milazzo |
| Andrzej Bielecki | Maria L. Manca |
| Andy Lane | Mariana Petrova |
| Angelo A. Camillo | Mario Fargnoli |
| Anita Mirjamdotter | Mariusz Kostrzewski |
| Anna Maroušková | Martin Schaffernicht |
| Antonio M. Perez-Flores | Martina Tomičić Furjan |
| Antonio Seijas-Macias | Massimo Panarotto |
| Carlo Drago | Maurice Yolles |
| Carlos E. Galván-Tejada | Meng Li |
| Carlos Mestanza-Ramón | Michael C. Smith |
| Carsten Hoyer-Klick | Michael R. Lissack |
| Chang Seop Rhee | Michael Riedl |
| Charilaos Latinopoulos | Michael Winokur |
| Chiara Magliaro | Miguel Martínez García |
| Chin-Feng Lin | Mihai Caramihai |
| Chris Fields | Mikko Kolehmainen |
| Christian Neureiter | Mindaugas Butkus |
| Colette Rolland | Mirjana Pejic Bach |
| Corinthias P. M. Sianipar | Mitsuru Kodama |
| Črtomir Rozman | Moinak Maiti |
| Cuauhtémoc Sanchez Ramírez | Molina Andrés |
| Dan-Cristian Dabija | Monika Ratajczak |
| Daniel R. Herber | Muhammad Tahir |
| Darja Kubečková | Narasimha Paravastu |
| David Louis Olson | Niamat Hossain |
| David Weinbaum | Nicola Montemurro |
| Didier Gourc | Nikos Panopoulos |
| Dinh Van Nam | Nirit Gavish |
| Dmitry Mikhailovich Nazarov | Oleguer Camerino |
| Donghoon Kim | Olga Jensen |
| Dunwen Wei | Oliver Cuate |
| Eder Mateus Nunes Gonçalves | Ondrej Krejcar |
| Édson Luis Bolfe | Pal Varga |
| Edward J. Garrity | Panagiotis Trivellas |
| Edwin Ordoukhanian | Parvaiz Ahmad Naik |
| Elias August | Paul Blazey |
| Elżbieta Bombik | Pavel Foltin |
| Elżbieta Ryńska | Pavel Praks |
| Emiliya Suprun | Payuna Uday |
| Eric Specking | Pedro Aceituno-Aceituno |
| Fani Antoniou | Peter Bican |
| Farooq Sher | Peter Weiss |
| Flavio Cirillo | Philippe J. Giabbanelli |
| Francesca Davoli | Ping Zhao |
| Francisco Alvarez Rodríguez | Piotr Korbel |
| Franco Bagnoli | Piotr Pałka |
| Frank Lefley | Piotr Staszkiewicz |
| Franz L. Dickert | Polinpapilinho Katina |
| Gabrijela Popovic | Punit Gandhi |
| Gaetano Chinnici | Qazi Mohammad Sajid Jamal |
| Garry Sotnik | Quynh Thi Tu Tran |
| Gavriil George Arsoniadis | Rajaguru Vasuki |
| Gayathri Devi Rajmohan | Ranjit Kaur |
| George Hloupis | Rea Lavi |
| Georgios Tsaramirsis | Ricardo Martínez-Cañas |
| Gerardo Febres | Richard Bibb |
| Giancarlo Sperlì | Robert Cavana |
| Giner Alor-Hernández | Rolando Flores-Carapia |
| Giovanni Biondi | Roman Dumitrescu |
| Giulio Di Gravio | Ron Hirschprung |
| Giuseppe Fileccia Scimemi | Ronald Edward Giachetti |
| Giuseppe Loprencipe | Russell Richards |
| Giusppe Attanasi | Sabina Hodžić |
| Graeme Nicholas | Sabine Berteina-Raboin |
| Gregory S. Parnell | Sameera Mubarak |
| Gregory Zacharewicz | Samundra Regmi |
| Grzegorz Kinelski | Sandro Schlindwein |
| Grzegorz Michalski | Sang Soo Kim |
| Guillermo Ronquillo Lomelí | Sang-Joon Kim |
| Gustavo Nagy | Santiago García |
| Hai Chien Pham | Santoso Wibowo |
| Hana Tomášková | Sarfaraz Hashemkhani Zolfani |
| Hanno Hildmann | Saurabh Singh |
| Hao Zhang | Serhii Stepenko |
| Harish Sundaresh | Serhiy Zabolotnyy |
| Heidi Davidz | Seyede Fatemeh Ghoreishi |
| Helbert Eduardo Espitia | Shahnawaz Muhammed |
| Herbert Kimura | Shahryar Sorooshian |
| Hitomi Sato | Sherif Abdelwahed |
| Huai Yu | Shiyong Li |
| Hua-Min Liu | Sigal Koral Kordova |
| Hugo Daniel Macedo | Silvan Urfer |
| Hye Jung Jung | Simona Catalina Stefan |
| Hyoung-Goo Kang | Sławomira Hajduk |
| Ignacio Martinez-Moyano | Stanislaw Raczynski |
| Isaías González Pérez | Stelios Ioannou |
| Ivan Ferretti | Štěpán Kavan |
| Iwona Bąk | Steve Dixon |
| Iwona Grobelna | Susana Lucas |
| Jacek Barcik | Svajone Bekesiene |
| Jamie Monat | Tadeja Jere Jakulin |
| Janet McIntyre | Tahamina Khanam |
| Jaroslaw Konior | Tammo Steenhuis |
| Javier Calvo-Amodio | Teodora Sanislav |
| Jeongsoo Yu | Teresa A. Oliveira |
| Jeon-Young Kang | Thaddeus Shannon |
| Jerome Hugues | Timothy Ferris |
| Jessica Riccioni | Todor Tagarev |
| Jessica Ventura | Tomasz M. Gwizdałła |
| Jifa Gu | Tomislav Martinec |
| Jitender Madaan | Trevor Bihl |
| Jizhou Tong | Ugo Bardi |
| Joaquim Mourato | Umberto Turrini |
| Joaquín Navajas | Vanessa Campos Climent |
| John Voyer | Vasyl Martsenyuk |
| Jong-Min Kim | Venkateswarlu Nalluri |
| José Damián Ruiz-Sinoga | Victor Murinde |
| Jose De Jesus Rubio | Vladimir A. Grishagin |
| José Pérez Ríos | Weng-Kun Liu |
| Josef Zelenka | William Young |
| Joseph E. Brenner | Williem Auping |
| Judith Dahmann | Xiang Zhang |
| Jurgita Antuchevičienė | Xiaowu Li |
| K. N. Kudryavtsev | Xin Wang |
| Karar Mahmoud | Xingwei Li |
| Karel Mls | Yang Liu |
| Kari Lippert | Yang Zhang |
| Katarina Zvarikova | Yaniv Mordecai |
| Katarzyna Lawinska | Yilun Shang |
| Kazuto Sasai | Yinpeng Li |
| Khalid Saeed | Yiwei Wang |
| Koki Arai | Yongchuan Tang |
| Krzysztof Grygierek | Yoram Reich |
| Kun-Li Wen | Youssef A. Attia |
| Larisa Ivascu | Yun-Bae Kim |
| Lazaros Moysis | Yunus Egi |
| Leise Kelli De Oliveira | Yu-Qing Wang |
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