Thinking of your personality as a system of parts is an intuitive way to notice and work with our difficult thoughts, feelings, urges. An example of this is a part of us that may crave chocolate, and another part criticizing it for this. Each part likely has its own thoughts, feeling, and urges. Or you many have felt a powerful part of you that is wise, compassionate, skillful, and courageous, even in difficult, overwhelming situations. Although I don’t do therapy or work with trauma, I find this vocabulary and concept effective in coaching.