Science teachers need to consider how they want to grow professionally. Thinking about one's future involves identifying the knowledge, practices, and attributes needed in a new role. By using a framework such as the science education trajectory (SET), teachers can more easily consider their professional options and work strategically toward them. Most professional development programs available to science teachers focus on improving instructional practice. This seems appropriate with the emergence of the "Next Generation Science Standards" ("NGSS") (NGSS Lead States 2013), but these types of programs comprise only one area in the universe of potential professional opportunities. The goal of this article is to help science teachers consider their professional options. The authors suggest a process to build a professional growth or learning plan, which they call a SET. A SET is specific to science education, and describes the knowledge, practices, and attributes a teacher needs to develop in order to progress to a new professional role. While this is not a classroom-based article, the authors hope to show teachers how they can grow professionally and benefit their students, their learning environment, and the science teaching profession.