This research is quantitative research using the True Experiment method. This research aims to determine the effect of project-based learning models on students writing skills in procedure text at grade X of Mas Al-Washliyah Tanjung Tiram. The population in this research were all class X students totaling 170 students. Determination of the sample using random sampling techniques. Based on this technique, a sample class was obtained with a sample size of 68 students, namely class X-3 = 34 Experimental class, and class X-4 = 34 as the Control class. The data collection technique used a writing essay test, namely pre-test and post-test. in this study the researcher conducted a normality test, paired sample t-test, and independent sample t-test using SPSS version 25.0. The results showed that there were differences in the writing skills of students who used the project-based learning model, with those who did not use the project-based learning model. The difference is shown from the results of the independent sample t-test, namely the  Tcount value at output = 4,890, while the T table value at the product moment table (0.05) = 1.668, with a df value of 66, then the criteria for testing the research hypothesis are Tcount > Ttable, so the hypothesis null (Ho) is rejected, and the alternative hypothesis (Ha) is accepted. This proves that there is a significant influence of the project-based learning model on the writing ability of class X students of MAS AL-Washliyah Tanjung Tiram.Â
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