One embodiment includes a portable device for an e-book, with at least a page including a section including text linked to an illustration. Another embodiment includes materials with a text sub file with texts, an illustration sub file with illustrations, and a logic sub file with rules on displaying the materials. One embodiment includes materials with a logic sub file that can analyze an attribute of, and provide a response to, a user. Another embodiment is applicable to apparatus and methods using a limited voice recognition dictionary at least tailored for a piece of materials that includes illustrations and instructions. The another embodiment can also use a limited image dictionary. The apparatus can include a headset, and the illustrations can include a piece of audio.