Horizon: Indonesian Journal of Multidisciplinary (HIJM) journal aims to stimulate discussions at all levels of mathematics education through disseminating significant and innovative scholarly studies that are of value to the international research communities. The journal welcomes articles focusing on all aspects of mathematics education including empirical, theoretical, methodological, and philosophical works that have a perspective wider than local or national interest. HIJM publishes only original scholarly works. Manuscripts that are indeed a derivative or replication/dublication (if there is not clear reason, justification) of previous work are not accepted and will not be published in HIJM. Please do not submit the same manuscript simultaneously or separately to HIEJM with another journal. In such cases the responsibility solely rests with the author(s).