The purpose of this study is to design a digital module based on mathematical communication skills. This a
development research which is carried out to determine the use of poor learning media and students’ low
comprehensive skills in understanding mathematical topics associated with relations and functions. One of the
solutions used to overcome this problem is by designing a digital teaching module using media. The research
and development method consisting of Analysis, Design, Development, implementation, and Evaluation
(ADDIE), were used to carry out this study. The results showed that the digital module is highly valid with a
total expert validation of 95.1% and in the very good category. Also, the students' response to the digital
module is in the very good category, with a total response criterion of 89.8%. Therefore, the designed digital
module has the ability to improve students' independence in learning because its use is not limited to
classrooms.
Keywords: Mathematical communication skill, Digital module, ADDIE