Three-quarters of the states adopted a new set of common academic standards in the past six months. However, education groups and publishers are preparing to follow with one of their own--curriculum materials that aim to embody the new standards. An early example comes from the Washington-based advocacy group Common Core, which released free online "maps" of the common standards that are intended to serve as a frame upon which teachers can build curriculum and lesson plans. As teacher guides, course outlines, lesson plans, and other supports for the common standards begin to flow into the marketplace, many in education policy circles are raising questions about how to interpret the makers' claims that their products are "aligned" to the common standards. The major publishers have been working to adapt their materials for many months, using as guidance the drafts of the common standards that were circulating for feedback before becoming final. Officials from the three largest--Pearson, McGraw-Hill Education, and Houghton Mifflin Harcourt--said they anticipate having their materials adapted and available by fall 2011.