The purpose of this study was to determine the skill levels of secondary school students regarding computational thinking, programming self-efficacy and reflective thinking aimed at problem solving and examine their experiences in the programming training process on robotic activities. Toward this purpose, a 10-week application was conducted with 55 students from 6th and 7th grades who received education at a secondary school in Western Black Sea region of Turkey during the school year of 2017-2018. The study was conducted using the mixed model and various scales in the quantitative dimension. On the other hand, a semi-structured interview form developed by the researchers was applied in the qualitative dimension. As a result, it was found out that students' computational thinking skills, programming self-efficacy and reflective thinking aimed at problem solving were moderate. Students' levels of computational thinking and programming self-efficacy were observed to differ depending on their grade levels. In addition, a positive and moderate relationship was found among the levels of computational thinking, programming self-efficacy and reflective thinking aimed at problem solving.