This study aims to find out whether using the Self-Directed Dialogue Technique is effective to teach students Speaking Ability and the effect size from the treatment process of using the Self-Directed Dialogue Technique in teaching
Speaking Ability to the eight-grade students of SMP Negeri 2 Pontianak in the academic year of 2022/2023. This research was a pre-experimental research. The population in this research was all the second-grade students of SMP Negeri 2
Pontianak. The total were 258 students that divided into eight classes. The classes were VIII A, VIII B, VIII C, VIII D, VIII E, VIII F, VIII G, and VIII H. furthermore, the measurement or the sample in this research that was VIII E. The researcher used cluster random sampling technique in order to determine the sample. To obtain data, researcher used direct methods, namely pre-test and post�test. The result showed that self-directed dialogue technique was effective in teaching student's speaking skill, it can be seen from the pre-test score (38.61) was in very poor level and the post-test (78.87) which is place in good level. The
students who were taught by using self-directed dialogue technique proven better than the students who did not. It could be seen from the calculation of t-test showed significant result with the sig -000 (below 0.05) which can be interpreted that the significant different was existed. Thus, this finding was fulfilled the requirement to reject the null hypothesis (Ho) or in other hand there is statistically significant difference between the means of pre-test and post-test in speaking after the treatment by using self-directed dialogue technique.

Keywords: Self-Directed Dialogue Technique, Speaking Skill, Pre-experimental Research