Complex Word Identification: Challenges in Data Annotation and System Performance Marcos Zampieri author Shervin Malmasi author Gustavo Paetzold author Lucia Specia author 2017-12 text Proceedings of the 4th Workshop on Natural Language Processing Techniques for Educational Applications (NLPTEA 2017) Yuen-Hsien Tseng editor Hsin-Hsi Chen editor Lung-Hao Lee editor Liang-Chih Yu editor Asian Federation of Natural Language Processing Taipei, Taiwan conference publication zampieri-etal-2017-complex https://aclanthology.org/W17-5910/ 2017-12 59 63