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Communicative Language Teaching (CLT) is a way to deal with the educating of second and unknown dialects that emphasis on cooperation as both the methods and the last objective of learning a language. Targets are (1) to discover Effectiveness of CLT Approach in Improving Speaking Ability. (2) huge contrasts between students who are instructed by CLT and not. Quantitative research is a true design experiment. Design used was a pretest-posttest control group design. Population is eighth grader students in Junior High School 1 Tegal. Research uses cluster random sampling with two group design (experiment group and control group). Data was broke down utilizing a t-test, score of the t-test is 2.744. Score of t-table is at 5% level importance and on level of 62 is 1.670, t-test result is higher than t-table (2.744>1.670). t-test hypothesis is rejected, and t-table hypothesis is accepted. CLT improve speaking capability.