Suharno Suharno
11 Maret University of Surakarta
Indonesia

Suharno was born in Sragen on June 3^rd, 1971. He earned his undergraduate degree in Engineering Study Program National Technology Academy Yogyakarta. Then, he earned his graduate degree from Engineering Study Program Gadjah Mada University. He earned his postgraduate degree from Technological and Vocational Education Study Program Yogyakarta State University. Recently he is working as a Teaching Staff (Lecturer) in the Engineering Study Program Surakarta State University.

Sukamto Sukamto
Yogyakarta State University
Indonesia

Sukamto was born on 25 February 2947. He is a professor in the department of Mechanical Engineering Education of the Faculty of Engineering, Yogyakarta State University.

Sutarto Sutarto
Yogyakarta State University
Indonesia

Sutarto was born in Cilacap, Central Java, Indonesia, on 1 September 1953. He currently works as a lecturer in Civil Engineering and Planning Education study program, Faculty of Engineering, Yogyakarta State University. He attained his bachelor degree in Civil Engineering Education from Yogyakarta Institute of Teacher Education and Educational Sciences (recently known as Yogyakarta State University), his master degree in Technology Education from State University of New York (SUNY) at Oswego, USA, and his doctoral degree in Vocational Education from Ohio State University (OSU), Ohio, USA.