This document discusses assessment for learning and making student thinking visible. It outlines that the purpose of assessment is to facilitate student learning by providing feedback, and to facilitate teaching by giving feedback to improve instruction. Assessment influences how students learn through its "backwash effect" - students focus their studying on tasks that are assessed. The document advocates for criterion-referenced assessment using clear learning objectives and assessment criteria to benchmark student understanding. It provides examples of using rubrics and formative assessment to continually provide diagnostic feedback to students and teachers to modify and improve learning.