On August 26 through 28, Professors Sergio André Rocha and Marco Aurélio Greco taught three classes on tax planning, in the course on tax planning and international taxation organized by the Institute of Tax Studies, Porto Alegre, Rio Grande do Sul. Each professor taught a class and on August 28 they held a joint class. The presentations used by Sergio André (in Portuguese) are available in these links: Class 1 and Class 2.