Yesterday, you received a letter from Phi Beta Kappa, a national academic honor society. Because you have maintained a 3.95 grade point average, they have invited you to become a member. Should you accept their invitation, you will receive a lapel pin and a certificate of membership (and the opportunity to learn the secret handshake). This is an example of

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This is a positive formal sanction because it is an official recognition of academic achievement by a formal organization, providing positive reinforcement through membership, a certificate, and a lapel pin.

Yesterday, You Received a Letter from Phi Beta Kappa, a National