To find out the feasibility and to know the effectiveness of the E-LKPD (Student Worksheet) Based on the Round Robin Type Cooperative Learning Model in Class VII English Subjects at Private Middle School IT Permata Hati Tebing Tinggi. This research is a Borg & Gall product development research and is combined with the Dick & Carey model. Subjects included 2 material experts, 2 media experts, 3 students in the individual test, 9 students in the small group test, and 26 students in the limited field test. The results showed that the E-LKPD Based on Cooperative Learning Round Robin Type was feasible to use, based on the validation of learning material experts 98.59% were in very decent qualifications, media expert validation was 94.64% in the very feasible category, individual trials were 92.42% were in the very feasible category, 95.70% for small group trials were in the very feasible category and 91.87% for field trials were in the very feasible category. The results of submitting the hypothesis prove that the learning E-LKPD is feasible to use, and there is a significant difference between the learning outcomes of students who are given treatment using the E-LKPD and printed media. This is indicated by the results of data processing tcount = 5.63 at a significance level of ? = 0.05 with df obtained t table = 50, so that tcount > ttable (5.63 > 1.63).