Findings are reported from a study that reconstructs the subjective theory of a group of teachers participating in an educational certification program regarding the values about their own processes of change. A sample of 12 Chilean teachers completed 35 interviews, and some personal documents were analyzed. The information was processed through descriptive and relational qualitative analysis, and it was coded using ATLAS. ti software. The results indicate that participants identify external factors and personal factors as the causes of their changes, differentiating between personal life and work, with emerging explanations that involve both settings. Furthermore, they recognize the importance of personal change in professional change.