SUMMARY FAIRA YOVANIE, NIM.2310246257, Development of E-LKPD Based on Socio Scientific Issues to Improve Students' Critical Thinking Skills and Learning Motivation on Acid Base Learning, supervised by Roza Linda and Lenny Anwar. Critical thinking skills are important 21st century skills for students in analyzing and evaluating a problem. Based on findings in the field, students' critical thin…