Abstract  -  This research is based on the teachers  difficulties in implementing the  2013 Curriculum  at Elementary Schools. The purpose of this research is to  describe  the  obstacles  faced  by  the  teachers  in  implementing  of  2013 Curriculum  in elementary school. This research used descriptive method. The results  of  this  research  indicate  that  the  majority  of  elementary  school  teachers  still  have  a  low  understanding  of  authentic  assessment  concept. Techniques  and  instruments  that  exist  in  the  teacher‟s  guide  are  less appropriate  to  the  school  culture.  Teachers  are  still  difficulties  in  preparing  self-assessment  and  peer  assessment  instruments.  They  find  difficulties  in measuring and describing the attitudes and learning performances.\ud
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Keywords: assessment, 2013 Curriculum, elementary School