In the summer of 2012, 36 3rd-6th grade teachers from 4 area districts and 14 buildings joined RAES project team members Cory Forbes, Christopher Soldat, Jeanne Bancroft, Kathy Long, Charlie Stanier, Mandy Biggers, Jaime Sabel, and Laura Zangori for 7 days of collaborative work to begin learning to use Reflective Assessment, a formative assessment strategy developed by the Lawrence Hall of Science (LHS) for use with FOSS science modules. The summer institute focused on the Earth science content strand, within which teachers engaged with relevant content as learners, experimented with engaging in ‘high-leverage’ formative assessment practices, and planned to begin implementing Reflective Assessment in their enactment of their Earth science modules in the 2012-2013 academic year. We want to again thank all project partners, including the University of Iowa (UI) Colleges of Education and Engineering, Grant Wood Area Education Agency (GWAEA) and Van Allen Science Teaching Center (VAST Center), LHS at the University of California-Berkeley, the UI Center for Global and Regional Environmental Research (CGRER), Iowa City Community School District (ICCSD), Washington Community Schools (WCSD), Clear Creek Amana Community School District (CCACSD), Highland Community School District (HCSD), and St. James School. A special thanks go out to Mark Brockmeyer and the Iowa City Schools for allowing us to hold the Summer Institute at the ICCSD Educational Services Building and to Kim Lange for joining us in July (while visiting from Germany) and providing helpful feedback.