Dear authors, readers, and librarians, our volume 19 issue 2 of 2020 has been published. It is a little bit late due to several circumstances. We made an improvement in this issue. Our articles are mainly in English to accommodate our international authors and readers.

We are sincerely grateful for the work done by our esteemed reviewers and appreciate the authors for their excellent papers submitted to this journal.

Finally, have fun reading this issue. We do hope that it will bring new research perspectives.

Based on the results of the Scientific Journal Accreditation Period VII of 2019 and the issuance of the Decree of the Director-General of Research Strengthening and Development of the Ministry of Research, Technology and Higher Education Number 36/E/KPT/2019, dated December 13, 2019, Jurnal Optimasi Sistem Industri (JOSI) is listed as the Grade 2 (Sinta 2) journal.

We are delighted with the result and acknowledge all parties involved in making this possible; the Industrial Engineering Department of Engineering Faculty at Universitas Andalas, the Institution of Engineers Indonesia, Badan Kerjasama Penyelenggara Pendidikan Tinggi Teknik Industri (BKSTI), the authors, the reviewers, the editors, and other parties using our articles, including citing our published articles in their papers, and last but not least the Arjuna's reviewers. We can not thank you enough.

It has been a very pleasant journey this year. We were awarded as a Grade 3 (Sinta 3) journal early this year, and by the end of 2019, we are the Grade 2 (Sinta 2). Such an achievement made possible by our editors, reviewers, authors, and readers. We are incredibly grateful for your confidence in publishing your best papers with us.

Again, thank you!