Mathematical communication ability is one of the abilities that must be possessed by students in 21st century learning. Worksheets of students who have not yet integrated mathematical abilities will hinder the achievement of learning objectives. Problem based learning is a model that can improve mathematical communication skills. This study aims to design mathematics student worksheets of problem based learning models to improve mathematical communication skills. This research is a type of development research with the ADDIE model. This research focused on the design stage of ADDIE model. The subject of this study consisted of teachers and students of MTs Class VIII, Seleman, Indonesia. The instrument of data collection consists of observation guidelines, interview guidelines and documentation sheets. Observation guidelines are used for the characteristics of students' mathematical communication. The interview guide used to retrieve student characteristics data from the teacher's persp.....

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