<![CDATA[This research is an experimental research with the aim of providing treatment in the form of assertive training interventions to improve interpersonal communication skills of class X students majoring in Marketing at SMKN X. This research uses a quasi experimental design with nonrandomized pretest-posttest control group design. The data are collected through observation, interviews, FGD, and interpersonal communication scale (Puspitasari, 2012). The data are analyzed by using SPSS 16 for windows with non-parametric statistical analysis paired sample t-test. The results showed that assertive training improved students' interpersonal communication skills. This can be observed from the statistical analysis between pre-test and post-test obtained p = 0.000 (p 0.05). In addition, an increase also occurred in the results of statistical analysis between post test and follow up with a value of p = 0.000 (p 0.05).KeywordsInterpersonal Communication; Assertive; Assertive Training; SMKN Students]]>
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