Because, simply checking off standard "mastery" isn't enough. Each standard is made up of so many pieces. If your students don't understand the pieces, they can't put the puzzle together. These progress monitoring checklists allow you to keep track of the ENTIRE standard and all the skills that make it up. In addition to the printable PDF version, you also have an editable PPT version (you must have PPT to edit) so you can change the standards wording if you need to, add or delete skills... basi