This report summarizes the activities and findings of the external evaluation of the "Science: It's Elementary" (SIE) program during the period from July 2008 through June 2009. The SIE program is managed by ASSET Inc. and overseen by the Pennsylvania Department of Education. SIE is an initiative aimed at improving elementary science instruction across the commonwealth of Pennsylvania. The program is focused on helping schools and districts implement an inquiry-based, hands-on science education program, with the ultimate goal of improving student learning. To accomplish its goals, SIE provides participating schools with module-based science instructional materials; teacher professional development around specific modules and inquiry-based science teaching more generally; and opportunities for strategic planning to help create supportive systems for science education reform. After a brief description of the SIE program and the evaluation plan, this report describes the teachers, schools, and districts participating in SIE; the nature and quality of the services provided by the program; and evidence of the program's impact on teachers, their teaching, and their students. The report concludes with a summary of major achievements and a list recommendations for the program. Appendices include: (1) Selected Teacher and Principal Questionnaire Tables Disaggregated by Cohort; (2) Composite Definitions; and (3) Student Assessment Analyses Regression Coefficients and Standard Errors. (Contains 34 tables, 9 figures and 20 footnotes.) [For "Year Two Evaluation Report," see ED518449.]