This document discusses principles for assessing learning. It outlines 12 guiding principles, including that assessment should be an integral part of the teaching and learning process, assessment tools should match learning objectives, results should be fed back to learners, and assessment should consider individual learning styles. The document also discusses assessing learning before, during, and after instruction using both traditional tests and more authentic tools like portfolios and performances. The overall message is that assessment of learning needs to be a valid, reliable, and meaningful way to evaluate student understanding and progress.