An idea that becomes true when acted upon is known as what?

• A. Self-fulfilling prophecy
• B. Thomas Theorem
• C. Role-set
• D. Role performance

Answer: (A)

The idea that a belief or expectation can bring about its own truth through the actions it provokes is called a self-fulfilling prophecy. When people act as if a prediction is true, their behavior can influence others and the situation in ways that cause the prediction to come to pass. For example, if a teacher expects a student to do well, they may give more attention and support, helping the student perform better and reinforcing that expectation. Conversely, believing a student will fail can lead to discouragement or less support, which can contribute to poorer performance and the predicted outcome.

This fits best because the others describe different social concepts: a role-set is the variety of roles tied to a position, and role performance is how someone enacts a role. The Thomas Theorem speaks to how people’s definitions of a situation can have real consequences, which is related but not as precise a formulation as the self-fulfilling prophecy about beliefs becoming true through action.