Although identity research has predominantly focused on college-bound adolescents, it has largely neglected vocational high school students who enter the job market immediately after graduation. Furthermore, most studies have concentrated on personal identity and have overlooked the concurrent development of social identity. This study examined the relationship between adolescents’ personal and social identities over three years of vocational high school. The participants were 4,264 vocational high school students in Japan (Time 1: 46.44% girls; M_age = 15.78). Using a random intercept cross-lagged panel model, the results indicated that within-person increases in social identity predicted increases in personal identity one year later. These findings highlight the importance of social identity as a valuable resource for personal identity development among vocational high school students, a group underrepresented in identity research.

尽管身份研究主要集中在即将上大学的青少年，但它在很大程度上忽视了毕业后立即进入就业市场的职业高中生。此外，大多数研究都集中在个人身份上，而忽视了社会身份的同步发展。本研究考察了职业高中三年内青少年个人身份和社会身份之间的关系。参与者为日本 4,264 名职业高中学生（时间 1：女生 46.44%； M_年龄= 15.78）。使用随机截距交叉滞后面板模型，结果表明，人体内社会认同的增加预示着一年后个人认同的增加。这些发现强调了社会身份作为职业高中生个人身份发展的宝贵资源的重要性，而职业高中生是身份研究中代表性不足的群体。