Science, Technology and Arts Research (STAR) Journal (ISSN: 2226-7522 (Print) and ISSN: 2305-3327 (Online)) is an official international journal of Wollega University, quarterly publishing the finest peer-reviewed research in all fields of science, technology and arts on the basis of its originality, importance, interdisciplinary interest, timeliness, accessibility, elegance and surprising conclusions. STAR Journal aims to promote rapid communication and exchange between the World and Wollega University, as well as other Ethiopian Universities and academic institutions. It mainly reflects the latest advances being made in many disciplines of scientific research in universities and academic institutions. The journal also publishes papers presented at conferences in Ethiopia and abroad. The multi-disciplinary nature of STAR journal is apparent in the wide range of articles from leading Ethiopian scholars. This journal also aims to introduce Ethiopian academic achievements to the world community, by demonstrating the significance of Ethiopian scientific investigations.