Soft Skill Differences between the Application of Student Learning Group In­vestigation and Conventional Mo­­­­del at Mechanical Engineering Program in Vo­ca­tio­­­­­nal High School. The purpose of this study was to describe: (1) the students soft skills level before and after the implementation of the student learning using group in­vestigation (GI) and conventional, and (2) the students soft skill differences using the GI learning and con­­­­ventional model.The research was a quantitative research. This re­search used a quasi-experimental de­­­sign, and the research design used the Non-Equi­valent Groups pretest-posttest de­sign. The re­­­sults showed that: (1) the level of soft skills using the application of the GI model on average increased by 6.14, and (2) the level of soft skills using the ap­pli­ca­­­tion of conventional models on average de­creased by 1.11. As a conclusion, there was a significant difference between the stu­dents soft skills using the ap­­plication of theGI and conventional model, and the soft skills for the in­tro­duc­ti­on of GI mo­­dels was better than the conventional model. Tujuan penelitian untuk mendeskripsikan: (1) soft skill siswa sebelum dan sesudah menerapkan pembelajaran group investigation ( dan konvensional, dan (2) Je­­nis pe­ne­­­litian merupakan penelitian kuantitatif, rancangan penelitian eks­pe­ri­men semu, se­­­dangkan desain penelitian Non-Equivalent Groups Pretest-Posttest De­­sign. Ha­sil penelitian menunjukkan bahwa: (1) tingkat keterampilan soft skill de­ngan pe­ne­rap­an model GI mengalami peningkatan margin nilai sebesar 6,14, dan (2) ting­­­kat ke­te­ram­­pilan soft skill dengan penerapan model konvensional tidak meng­alami kenaikan ni­lai, tetapi mengalami penurunan margin nilai sebesar 1,11. Ada per­be­­­daan yang sig­ni­fikan soft skill siswa antara penerapan model GI dan konvensional, un­­­tuk pengantar soft skill model GI lebih baik dibanding dengan model konvensional
