eng Science and Education Publishing American Journal of Educational Research 2327-6150 2019-12-02 7 12 893 900 10.12691/education-7-12-1 EDUCATION20197121 article Fika Indah Perawansa prawansafikaindah@gmail.com 1 Ani Minarni 1 Edy Surya 1 Mathematics Education, Post Graduate School, State University of Medan (Unimed), Medan, Indonesia This study aims to: 1) Obtain discovery-based learning with SAVI approach assisted by GeoGebra (DLSG) that meet validity, practicality, and effectiveness criteria; (2) Describe the improvement of mathematical communication skills (MCS) of the students taught through DLSG; (3) Describe learning motivation of the students taught through DLSG. This research is a development research conducted in two stages, the first stage is developing a DLSG based learning device, the second stage is implementing a DLSG based learning device at grade IX senior high school students MTs Aisyiyah Medan. The learning devices produced from this research are: Learning Implementation Plan (LIP), Teacher's Book (TB), Student's Book (SB), Student Worksheet (SW) and MCS test. The results of the research are: (1) the DLSG-based learning devices developed have met the validity, practicality, and effectiveness criteria; (2) there is the improvement in MCS of the students taught through DLSG. The average MCS score in trials I and II were 81.82 and 94.12; (3) there is the improvement in learning motivation of the students taught through DLSG, the motivation score increased from 85.97 to 86.20. http://pubs.sciepub.com/education/7/12/1/education-7-12-1.pdf research development mathematical communication skills student learning motivation development of learning devices discovery learning with SAVI approach assisted by GeoGebra