However, some of their roles, including education and discipline, overlap. This sometimes leads to friction. It is important to note that the American Institute of Architects (AIA) Code of Ethics and Professional Conduct is prescriptive and composed of 6 canons. The first five canons exist in order of scale, starting from the most general ones up to those that concern the largest number of people, the public, down to the smallest number, colleagues and collaborators. The sixth canon, a newcomer, addresses the environment, which covers the largest scale of all, that of the entire planet. The AIA Code encompasses all four approaches to ethics. Its canons invoke virtue ethics to push architects to "maintain and advance their knowledge..." Contractual ethics appears in statements such as "members should embrace the spirit and letter of the law..." . The ethic of duty emerges online as “members should exercise educated and uncompromising professional judgment…'' Finally, we hear a utilitarian focus on consequences when we read that members should “carefully consider social and environmental impacts of their professional activity".