Developing Teachers Science Process SkillsProfessional development. High-quality professional development has the power to affect teacher instruction and student leaming. The Council of Chief State School Officers (CCSSO, 2008) targeted five indicators of high-quality professional development in mathematics and science. These areas included "content focus, active leaming by teachers and coherence with curriculum/standards, collective participation, and sufficient time" (CCSSO, 2008, p. 8). Yoon, Duncan, Lee, and Shapley (2008) noted that professional development can improve student achievement by enhancing teacher knowledge, skills, and motivation