The Girl Recognition System is the reward or badge system of the Australian Guide Program. Individual Guides, Patrols or whole units can choose to work towards appropriate challenges in a wide range of areas, though it is not compulsory. There are 4 main types of challenge badges (Explore, Create, Achieve and Discover) each pursued in a different way. Some allow Guides to set their own personal challenges, some have set criteria; some focus on a certain topic or skill, others cover a group of skills in an area, and some are based on a wide variety of different areas across the Australian Guide Program.