The communication skill of Indonesian student is still very low compared to other countries. This problem happens because the teacher still dominates in the learning process. The purpose of this research is to develop The Lesson Learned Plan of mathematics that integrates the communication skill. This research uses research and development approach. The subjects consist of mathematics teachers, principals and students of 65 Junior High Schools in Sukoharjo, Central Java. Exploration and analysis of research data needs use questionnaires, interview, and documentation. Data collection methods are enriched using Focus Group Discussions (FGD). The results showed the development of Lesson Learned Plans that integrates the communication skill is conducted by 1) including the communication skill that will be developed according to Basic Competence (BC), 2) developing indicator to reach BC, 3) formulating the learning objectives, 4) developing the relevant lesson, 5) developing a learning activity that will be conducted, 6) developing scoring tools to measure the quality of communication skill. In addition, it also conducts literacy planning in the learning process. Teachers and students desperately need mathematics learning based on double loop learning to guide students to improve their communication skill.

Keywords : Communication Skill, Double Loop Learning, Lesson Learned Plan, Mathematics Learning.