The "2003 National Science Teachers Association Standards for Science Teacher Preparation" (NSTA-SSTP) were developed to provide guidelines and expectations for science teacher preparation programs. This article is the fourth in a special "JSTE" series on accreditation written to assist science teacher educators in meeting the "NSTA-SSTP". In this article, the authors discuss pedagogical content knowledge and how this is expressed in the "NSTA-SSTP." Included are competencies and examples needed for a science teacher preparation program to document developing pedagogical content knowledge in preservice science teachers.