Definition : A schema (usual plural : schemata) is a mental representation of a situation, topic, text etc which creates expectations and aids (or may aid) interpretation of similar contexts. Different writers divide schemata in different ways and use different terms, but some of the most common and most relevant to language teaching are into Social Schemata, Content Schemata, Formal Schemata, Linguistic schemata, and Ideological Schemata.
- Social schemata - your knowledge of what happens in specific situations or events: for example, my "exam schema" includes candidates sitting at individual tables in silence, a clock on the wall, an invigilator present etc . However, this is culturally determined and reflects my experience with British style exams. An Italian's "exam schema" might be of an oral interview by a panel of teachers, watched by other students
- Content schemata - your background knowledge of a topic. I'm interested in astronomy and read quite a lot of popular science magazines like "New Scientist" and "American Scientific" for articles on the subject. I can usually follow them, but if I were reading a paper in a scientific journal, I'd be unlikely to understand it. My background knowledge of the specific topic would be insufficient to allow me to follow and interpret the argument.
- Formal schemata - your knowledge of the rhetorical organisation and conventions of a text. For example, if I'm reading an expository text, I'll expect it to be organised into paragraphs, each dealing with a specific topic or subtopic, with topic sentences used to specify what each paragraph deals with and connectives used to highlight the relationship between ideas. If on the other hand I'm reading a narrative text. I'll expect a chronological ordering and reklation of past events. For specific genres of narrative text, it won't surprise me if other features are included. Eg I'd expect the use of direct speech in both press reports and novels; and in novels possibly the use of "flashback" technique" - the relation of a later event which the reader doesn't fully understand first, in order to make them want to read on.
- Linguistic schemata - your ability to decode the linguistic features of a text - ie your ability to decode the letters or phonemes, understand their combination into words, the combination of those words into syntactic units etc. Linguistic schemata are therefore a matter of bottom up processing.
- Ideological schemata - expectations of attitudes to various social, political etc issues. The danger of raising issues which may create iseological dissension in the classroom has led to the so-called "PARSNIPS policy" in EFL publishing - the avoidance in textbooks of the topics politics, alcohol, religion, sex, narcotics, isms (eg terroism or feminism), and pork. See Thornbury (2010) for a critique of this policy.
Cultural factors affecting schemata : As the above examples show, your various schema regarding a subject affect your top-down processing of what is said. For example, my schema for "weddings" includes church /white dress / rice etc. Therefore if I hear "There were loads of pigeons in the churchyard pecking up the rice", I will assume a wedding has taken place. If for eg cultural reasons, or because you lack technical knowledge, your schema for the topic is different from the speaker's/writer's, comprehension problems may arise.
In the classroom, relevant schemata can be activated prior to a reading or listening activity by eg asking learners to predict from the title or a brief description of the context what it will be about, what will happen, what people will do/say etc. This can :
a) aid bottom up processing : discussing a topic, roleplaying a situation etc means that learners will have the relevant language (lexis, functional exponents etc) at the forefront of their minds when listening to or dealing with the text. This will facilitate comprehension.