Adolescence have developmental tasks: exploration and making decision about their future, especially about their future career (Santrock, 2014). For making good decision, adolescence have to make good adaptation to various changes in the environment. However, adolescents who have type II thinking style indicated have low career decision self-efficacy because they show lower level cognitive complexity and have norm favoring tendency (Zhang, 2009). Through planned happenstance skills, career decision self-efficacy from adolescents who had type II thinking style could be improved. The participants in this study were 720 students, who are on 11^th and 12^nd grade from three middle schools in Jakarta. We used the measuring tools: Career Decision Self-Efficacy - Short Form; Thinking Style Inventory – Revised II, and Planned Happenstance Career Inventory, which has been adapted into Indonesian language. The researchers used multiple regression by applying the MACRO PROCESS by Hayes (2013). We found that planned happenstance skills partially mediated the impact of type II thinking style towards career decision self-efficacy in adolescence. The limitation of this study we just study the impact of type II thinking style towards career decision self-efficacy.

Keywords: adolescence, career decision self-efficacy, planned happenstance skills, thinking style type II.