Vol. 2 No. 1 (2021)

This issue contains articles from two different countries, Nigeria and Indonesia. The authors/co-authors are from various institutions such as University of Ilorin, Universitas Muhammadiyah Yogyakarta, Politeknik Enjinering Indorama, Universitas Islam Batik, Universitas Sebelas Maret, Universitas Sahid Surakarta, Universitas Dr. Soetomo Surabaya, Universitas Pancasakti Tegal, and Universitas Ahmad Dahlan.