Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Applied System Innovation 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 15 days and the median time to publication was 42 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:
| Abbas, Azhar | Li, Chunguo |
| Abdul, Majeed | Li, Tan |
| Abreu, António | Li, Tao |
| Aguasca-Colomo, Ricardo | Li, Yuxing |
| Ahmed, Mohiuddin | Liang, Yi |
| Alessandro, Mengarelli | Lin, Jeng-Chyan Muti |
| Anysz, Hubert | Linares-Barranco, Alejandro |
| Asciuto, Antonio | Liu, Zhifu |
| Babkir, Ali | Lu, Wei |
| Bakhshinejad, Ali | Madsen, Dag Øivind |
| Bartlomiej, Oszczak | Mahian, Omid |
| Basov, Suren | Mandelli, Stefano |
| Behrendt, Cezary | Mao, Lei |
| Bento-Gonçalves, António | Mehrpouya, Mehrshad |
| Bocharova, Irina | Monteiro, João |
| Bordel Sánchez, Borja | Mosavi, IAmir |
| Borkovcová, Marie | Nair, Gopika |
| BUI, Ngoc-Tam | Navid, Knejad |
| Burlacu, Adrian | Nkenyereye, Lewis |
| Bylieva, Daria | Orehovački, Tihomir |
| Cano-Ortega, Antonio | Orkusz, Agnieszka |
| Chand, Mohan Bahadur | Otero, Pablo |
| Chen, Shih-Chih | P. Khope, Akhilesh S. |
| Chen, Yung Hsiang | Pecchi, Matteo |
| Cheraghian, Goshtasp | Pellegrini, Marco |
| Cherstvy, Andrey | Peng, Jie |
| Cioccolanti, Luca | Pérez-García, Vicente |
| Ciszkiewicz, Adam | Peyman, Razi |
| Cmiljanic, Nikola | Pienkowski, Krzysztof |
| Cohen, Rami | Poór, Peter |
| Costa, Carlos Miguel | Pouliakis, Abraham |
| Costa, Susana | Prieto, Jesús-Ignacio |
| Črešnar, Rok | Rafael Valotta, Rodrigues |
| Cristescu, Marian Pompiliu | Roy, Dhruvajyoti |
| Cuculić, Aleksandar | Roy, Spandan |
| Czerwinski, Robert | Ruz Ruiz, Mario Luis |
| Datta, Arka | Sabban, Albert |
| Delichatsios, Michael A. | Saleem, Muhammad |
| Demidova, Liliya A. | Salehi, Amin |
| Dhir, Amandeep | Saxena, Prateek |
| Díaz-Rodríguez, Miguel | Schiavon, Michele |
| Dong, Qinglin | Schmid, Giovanni |
| Dragisa, Stanujkic | Schmitt, Sebastian |
| Duer, Stanisław | Schneider, Lucas |
| Dzedzickis, Andrius | Serna, Sergio |
| Elahi, Ehsan | Sfica, Lucian |
| Eliseev, Vladimir | Shala, Ahmet |
| Escobedo, Pablo | Shamshirband, Shahab |
| Farhan, Laith | Sharma, Abhishek |
| Fikus, Bartosz | Silaghi, Helga |
| Frighi, Valentina | Silvestri, Cecilia |
| Frigo, Oriel | Socas, Rafael |
| Gordon, Jeffrey | Song, Jifeng |
| Grigorescu, Adriana | Soto, Paul |
| Hargreaves, Carol | Staszkiewicz, Piotr |
| Hölbl, Marko | Stauvermann, Peter Josef |
| Holubek, Radovan | Stevens, Gunnar |
| Hong, Tao | Tornabene, Francesco |
| Hossain, Belayat | Torrecilla Sánchez, Eva María |
| Hu, Changjian | Tripathi, Takshashila |
| Hussain, Muhammad Imtiaz | Tsuboi, Tsutomu |
| Ikerionwu, Charles | Tuclea, Claudia |
| Infante-Moro, Juan Carlos | Ullah, Md. Hafij |
| Irina, Mocanu | Ulloa Cerna, Alvaro |
| Islam, Saiful | Verdini, Federica |
| Jamali, Seyed Hossein | Vojtovic, Sergej |
| Jamil, Faisal | Wang, Ning |
| János, Szenderák | Wang, Xianzhi |
| Jiang, Guo | Wang, Zhuoying |
| Jorge Luis Zambrano, Martinez | Warmann, Emily |
| Karl, Christian Wolfgang | Watter, Holger |
| Karoń, Grzegorz | Witowski, Jan |
| Karuppuswami, Saranraj | Włodek, Tomasz |
| Kavadias, Kosmas | Xu, Huijin |
| Khan, Md. Shakhaoath | Xu, Sheng |
| Khan, Irfan Ahmad | Xue, Bing |
| Kouziokas, Georgios N. | Yang, Huai |
| Kováč, Viliam | Yazdani Asrami, Mohammad |
| Kracík, Petr | Zare, Mohsen |
| Krzywanski, Jaroslaw | Zhang, Lei |
| Kumar, Arkadeep | Zhang, Qi |
| Kuo, Wen-Ten | Zhang, Qi |
| Lambán, María Pilar | Zhang, Yu |
| Langmann, Reinhard | Zhao, Xu-dong |
| László, Vasa | Zhou, Yang |
| Legendre, Tiffany | Zmywaczyk, Janusz |
| Lelea, Dorin | Zunino, Claudio |
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