Analysis of The Implementation of Interdisciplinary Learning in Improving Students’ English Speaking and Writing Skill

The aims of this research: 1. To describe in detail the implementation of Interdisciplinary learning. 2. To describe the planning of implementation, 3. To describe the process of Interdisciplinary between English and Economy , 4. To describe the assessment done 5.To describe in detail the students’ achievements as the effect for Speaking and Writing skills .The population is class X of SMA Lentera Harapan Curug. The sample is 35 and the method is descriptive research, and it is a case study. The results show: 1. The interdisciplinary implemented is multidisciplinary because it is suitable for the high school. 2.The interdisciplinary learning planning is at the beginning of the semester. 3.The implementation consists of preliminary, core, and closing activities. 4.The assessment facilitated an authentic to assess the cognitive, psychomotor, and affective domains.5.The implementation developed students writing and speaking skills that can be seen from the student’s achievement which is in good score.