This study aimed to draw appropriate teaching-learning and assessment methods for the National Competency Standards (NCS) based curriculum as well as suitable policy support measures, through the analysis of the high school level NCS-based curriculum. In order to do so, the teaching-learning and assessment methods of the NCS-based curriculum ― which is to be applied to all specialized high schools from 2018 ― were analyzed, and the requirements and priority of each NCS-based curriculum teaching-learning and assessment methods were drawn. Based upon these findings, policy suggestions were made regarding some issues: 1) To operate a training program for NCS teaching-learning and assessment capacity building, 2) to disseminate the NCS teaching-learning and assessment methods management manual and well-practiced exemplary cases, 3) to reinforce on-job NCS teaching-learning and assessment methods consulting, 4) to vitalize studies on NCS-based teaching-learning and assessment methods, 5) to develop and distribute online education contents, and 6) to set up an online community for NCS education officials. ...