Please be mindful that the required reading is authored by Martin, Oades, and Caputi and published in 2012.
You are required to do additional research and cite at least THREE journal articles or book chapters of published books (excluding the textbook and the required reading) for this question. Researching on contemporary findings and opinions published after 2012 will also allow for more updated perspectives to add substance and credibility to your critique on whether personality can be changed.
When planning and writing the essay, do remember that an analytical argument and critical evaluation will gain more marks than a descriptive essay.