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highlighting of these words in the text; and social interaction like in interactive text-based
communication media such as email, forums and instant messaging services.
67. The 2018 framework defines four dimensions of texts: source (single, multiple); organisation
and navigation (static, dynamic); format (continuous, non-continuous, mixed); and type
(description, narration, exposition, argument, instruction, interaction, transaction). The first three
dimensions are typical of specific situations and tasks and may trigger the use of specific
processes. In contrast, the fourth dimension is included mainly for purposes of domain coverage.
Source
68. In the PISA 2018 framework, a source is a unit of text.
Single texts are defined by having a
definite author (or group of authors), time of writing or publication date, and reference title or
number. Authors may be defined precisely, like in most traditional printed books, or more vaguely
like the pseudonyms in a blog post or the sponsors of a website. A single text may also be
construed as such because it is presented to the reader in isolation from other texts, even if it does
not explicitly bear any source indication.
Multiple texts are defined by having different authors, or
being published at different times, or bearing different titles or reference numbers. Note that in the
PISA framework, “title” is meant in the sense of a bibliographical catalogue unit. Lengthy texts that
feature several sections with titles and subtitles are still single texts, to the extent that they were
written by a definite author (or group of authors) at a given date. Likewise, multi-page websites are
single texts as long as there is no explicit mention of a different author or date. It is useful to point
out that multiple texts may be represented on a single page. This is the case in printed newspapers
and in many textbooks, but also in forums, customer reviews or question-and-answer websites.
Finally, a single text may contain embedded sources, that is, references to various authors or texts
(Rouet & Britt, 2014;
Strømsø et al., 2013).
69. The source dimension in PISA 2018 replaces the distinction between “multiple” and the other
types of “text formats” in the previous versions of the framework.
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