Instructional materials have evolved over time to include important features such as being well organized with accurate and up-to-date information presented without biases. They also include real-world applications of skills. Specialized formats are available through organizations like NASTA that provide Braille, audio, digital text and large print materials. A teacher's manual contains instructional resources and activities to support instructional strategies, with its organization affecting how well it can be adapted for classroom use. Key features of effective teacher manuals and student materials include practicality, alignment to content, total coverage of lessons, readability, information on learning methods, ways to assess learning, support for planning and management, and ways to build teacher confidence.