“…In such cases, the user must rely on what little knowledge they have of the site or document to form an ad hoc representation of how information is organized or presented, and, more importantly, how the material relates together conceptually (Gernsbacher, 1990). This knowledge can include elements such as the perceived structure of the material, existing domain knowledge, or even prior search strategies (Foltz, 1996;Meyer, Middlemiss, & Theodorou, 2002;O'Reilly & McNamara, 2007;Voss & Silfies, 1996). Notably, the more closely this ad hoc structure matches the actual structure of the source, the likelihood that the learner actually understands the material and can thus find additional novel information, also increases (Kintsch & Yarborough, 1982;Mayer, 1982;Taylor, 1982).…”