End-of-Book Content Mastery tests provide teachers with a view of each student’s overall mastery of curriculum content. The interpretation of these results guides teachers’ decisions regarding whether to move students to the next book or to reteach particular concepts and provide additional practice for specific skills. Progress Indicators monitor growth in the critical skills of literacy. These tests are the same ones used for baseline and are designed to provide valid and reliable measures of speed and accuracy of word reading, reading comprehension, spelling of regular and irregular words, and writing.