Abstract
The article addresses research on cognitive biases and dissonance in professional teachers in a faculty of education from a public university in Colombia. The effects of these phenomena on the decision-making and professional development of these teachers are examined. Teachers in other professions may lack professional educational training and this leads to errors in them, which affects their ability to teach effectively. The presence of cognitive biases can influence teachers' perception and decision-making, which affects the quality of teaching. Cognitive dissonance can arise when teachers face contradictions between what they teach and what they believe, which can create tensions and affect their performance. This study seeks to identify how these phenomena affect non-preservice teachers in a college of education, providing valuable information to improve training and support for novice educators.