Group therapy helps clients develop social skills. Some groups do so by using such procedures as role-playing in which members rehearse certain difficult situations (a job interview, asking for a raise, etc.) while other groups offer constructive criticism. Members of groups learn to listen, respond to others, avoid interrupting while others are talking, be less judgmental, and be more capable of expressing empathy. These skills will be of great value in future social interactions. This is called the development of what?