Authors should submit only papers that have been carefully proofread and polished. Manuscripts are accepted with the understanding that they are original or extended version of previously published papers in conferences and/or journals and that, if the work received an official sponsorship, it has been duly released for open publication. Before submission please make sure that your paper is prepared using the journal paper template. The authors must refer to [Jurnal The Messenger] for writing format and style (please download and use as template for initial manuscript submission). This will ensure fast processing and publication. Any papers not fulfilling the requirements based on the guideline to authors will not be processed.