This document summarizes key aspects of curriculum design approaches from chapters 9 and 10 of the book "Language Curriculum Design" by I.S.P Nation and John Macalister. It discusses three common approaches to the curriculum design process: the waterfall model, focused opportunistic approach, and layers of necessity model. It also covers negotiated syllabuses, where teachers work with learners to make joint decisions about curriculum design elements. Requirements for implementing a negotiated syllabus include establishing negotiation procedures, planning course content and activities, setting learning goals, and evaluating outcomes.