Tessa Perkins identifies 5 assumptions about stereotypes that are often made but can be challenged: 1. Stereotypes are not always negative - they can also portray positive traits. 2. They are not only about minority or less powerful groups, but can also target more powerful groups. 3. People can hold stereotypes about their own group. 4. Stereotypes are not rigid or unchanging, but can develop over time. 5. Stereotypes are not always false, as they must contain some truth about the group in order to form in the first place.