This issue consists of 5 articles from 12 authors affiliated with 4 institutions from Indonesia and Nigeria including Universitas Pendidikan Indonesia, Siliwangi University, Ahmadu Bello University and Nusa Mandiri University.

This issue consists of 5 articles from 14 authors affiliated with 4 institutions from Indonesia including Universitas Pendidikan Indonesia, Siliwangi University, Sultan Ageng Tirtayasa University and Nusaputra University.

This issue consists of 5 articles from 19 authors affiliated with 7 institutions from 3 countries including:

• Indonesia (Universitas Pendidikan Indonesia, Institut Teknologi Telkom Purwokerto, Sultan Ageng Tirtayasa University, Universitas Langlangbuana, Universitas Jenderal Achmad Yani)
• Japan  (Shibaura Institute of Technology)
• Vietnam (Hanoi University of Science and Technology)