Professor Stewart wrote a very positive letter of recommendation for a student despite his having doubts about her competence. Cognitive dissonance theory best explains why he subsequently began to develop more favorable attitudes about the student's abilities.
Attitudes are often seen as a stable personality trait, something that someone is born with or develops early in life and doesn't change much. However, research suggests that attitudes can actually be quite fluid, and that people's attitudes can change quite easily, depending on their current situation and the people around them.
This theory is supported by the fact that people's attitudes often change when they move to a new place, start a new job, or go through some other major life change.
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