One potentially interesting idea is to write a psychology case study of a particular individual or group of people. In this type of paper, you will provide an in depth analysis of your subject, including a thorough biography. Generally, you will also assess the person, often using a major psychological theory such as Piaget’s stages of cognitive development or Erikson’s eight-stage theory of human development . It is also important to note that your paper doesn’t necessarily have to be about someone you know personally. In fact, many professors encourage students to write case studies on historical figures or fictional characters from books, television programs, or films.