Philosophiae Doctor - PhD / It has been noted by Lin (2013) that studies on multilingual talk, as illustrated by code switching in the classroom, have been repetitive and descriptive, and have for a while not been underpinned by substantially new or different questions (Lin, 2013:15). First, many of the studies in the literature have, for instance, concluded that there is a functional allocation of languages (FAL) in multilingual classroom teacher talk (e.g. Baker, 2012; Martin, 1996; Probyn, 2006, 2014; Jegede, 2012; Modupeola, 2013; Salami, 2008), such that language „a‟ is used for presentational knowledge, and language „b‟ is used for explanatory knowledge, and these claims have not been subjected to sustained scrutiny. Secondly, codeswitching and translanguaging increasingly have been the dominant and exclusive frameworks used, and this has limited the kinds of insights that can be obtained or the kinds of questions that can be posed. Thirdly, where the effects of multilingual teacher talk on students‟ understanding or knowledge are at all captured in studies, such effects have either been based on researcher intuition or have not been the object of sustained empirical demonstration. Fourthly, many studies have assumed merely that it is the configuration of languages that produces claimed effects of multilingual teacher talk, and attention has hardly been paid to repetition of content or to knowledge structure. Fifthly, it is not often the case that studies or findings are presented in a nuanced form that takes into account the possible effect of different subject types, school types or levels of study. Sixthly, and overall, many studies making claims on the effect of teacher‟s code-switching or trans-languaging on students‟ knowledge do not theoretically engage with knowledge, beyond the distinction between presentational and explanatory forms of knowledge, thus illustrating what Maton (2013) regards as “knowledge-blindness” (that is, the paradox of limited engagement with knowledge structures in pedagogical research making knowledge claims). As a result, little is known about how specific units of knowledge are encoded according to categories in a theory of knowledge, how knowledge encodings interface with languages, and how composite knowledge structures-language profiles can be visualised. This study draws on Legitimation Code Theory Semantic and Terminology Theory in order to investigate the interface of language and knowledge in multilingual teacher-talk in science and business studies classrooms in Yola, North-Eastern Nigeria. This focus should make it possible to answer questions such as the following which, though important, have not often been posed on account of the limited engagement in the research on classroom multilingualism with theories of knowledge: a) to what extent is it appropriate to claim that there is a functional allocation of language in multilingual teacher-talk (in which language „a‟ is used for so-called presentational knowledge, and language „b‟ for explanatory knowledge)?; b) what kinds of encodings of knowledge occur in a set of science and business studies lessons?; c) given documented visual patterns of knowledge dynamics emerging from recent research in the sociology of knowledge (e.g. semantic waves, semantic flatlines both high and low, downward shift and upward shift), (Maton: 2013, 2014a, 2014b), what knowledge profiles are observable and how does language use in multilingual teacher-talk map onto these patterns?; d) how are any observed differences in the composite knowledge-language profiles to be explained?; and e) what effects do various language-knowledge profiles have on students‟ understanding of the lesson and on their demonstration of their knowledge? Data for the study was derived from transcripts of audio-recorded multilingual teacher-talk in two subjects (integrated science and business studies) as taught in grades seven and nine in four secondary schools (two private and two public schools) in Yola, North-East Nigeria. Findings show, among others, that it is not always the case that the official classroom language (English) is used for introductory discourses, and the non-official classroom languages are used for explanatory discourses. Findings further reveal that it is not primarily the functional allocation of languages that explains perceptions or empirical claims of enhanced student understanding. We also observed that the number of content iterations, combined with knowledge structures, is an important factor that enhances or explains the performance of students. While this research has paid a lot of attention to teacher talk in the classrooms in two sites in Yola, North-East, Nigeria, where the use of Hausa and Fulfulde languages by the students is mainly in the spoken form, it would be interesting for future research to replicate this type of study in an environment where the non-official language of the classroom is perhaps used more frequently in reading and writing.

Achieving equitable opportunities to learn has been recognized as an important issue in multilingual content classrooms. However, partially because mathematics is conceptualized as a language-free subject, there is limited research examining linguistic minority students’ opportunities to learn in mathematics classrooms. The purpose of this research is to identify linguistic minority students’ opportunities to learn in mathematics classrooms in a Canadian multilingual urban elementary school, where English was the main instructional language. Drawing on cultural historical activity theory, this study focuses on two aspects of learning: externalization, which emphasizes learners’ creation of new cultural artifacts and new contexts to apply the given artifacts, and internalization, which emphasizes learners’ acquisition of preexisting cultural artifacts. In this ethnographic study, I examined the activity systems of participatory action research (PAR) with the activity system of regular mathematics lessons. Within these activity systems, I focused on newly-arrived English language learners’ (ELLs) participation. Specifically, I examined the range of opportunities to learn afforded to students in the two activity systems and identified how focal ELLs accessed these opportunities to learn. In the activity system of PAR, which emphasized externalization, students conducted research and presented their conclusions in order to implement changes in their school environment. All students, however, did not participate equally. Specifically, the focal ELLs were not able to access these opportunities to learn as a result of group dynamics, marginalized social identities, and other students’ perceptions of their linguistic ability. In the activity system of regular mathematics lessons, which emphasized internalization, the teacher organized lessons in ways that allowed focal ELLs to receive extra support and resources to reach the curriculum expectations. These mathematics lessons allowed focal ELLs to increase their participation through mathematical reasoning, problem solving, and explanations with a variety of resources including visual representations. A critical examination of the interactions revealed that focal ELLs’ opportunities to learn were expanded or limited depending upon classroom configurations. Furthermore, this research suggests that students’ social identities serve as both a medium and a product of learning. These results have valuable implications for developing inclusive classroom practices and curriculum in multilingual content classrooms.

Achieving equitable opportunities to learn has been recognized as an important issue in multilingual content classrooms. However, partially because mathematics is conceptualized as a language-free subject, there is limited research examining linguistic minority students’ opportunities to learn in mathematics classrooms. The purpose of this research is to identify linguistic minority students’ opportunities to learn in mathematics classrooms in a Canadian multilingual urban elementary school, where English was the main instructional language. Drawing on cultural historical activity theory, this study focuses on two aspects of learning: externalization, which emphasizes learners’ creation of new cultural artifacts and new contexts to apply the given artifacts, and internalization, which emphasizes learners’ acquisition of preexisting cultural artifacts. In this ethnographic study, I examined the activity systems of participatory action research (PAR) with the activity system of regular mathematics lessons. Within these activity systems, I focused on newly-arrived English language learners’ (ELLs) participation. Specifically, I examined the range of opportunities to learn afforded to students in the two activity systems and identified how focal ELLs accessed these opportunities to learn. In the activity system of PAR, which emphasized externalization, students conducted research and presented their conclusions in order to implement changes in their school environment. All students, however, did not participate equally. Specifically, the focal ELLs were not able to access these opportunities to learn as a result of group dynamics, marginalized social identities, and other students’ perceptions of their linguistic ability. In the activity system of regular mathematics lessons, which emphasized internalization, the teacher organized lessons in ways that allowed focal ELLs to receive extra support and resources to reach the curriculum expectations. These mathematics lessons allowed focal ELLs to increase their participation through mathematical reasoning, problem solving, and explanations with a variety of resources including visual representations. A critical examination of the interactions revealed that focal ELLs’ opportunities to learn were expanded or limited depending upon classroom configurations. Furthermore, this research suggests that students’ social identities serve as both a medium and a product of learning. These results have valuable implications for developing inclusive classroom practices and curriculum in multilingual content classrooms.

Deutschlandweit nehmen die Schulen zahlenmäßig von Jahr zu Jahr zu, die ein bilinguales Angebot z.B. als Zweig oder als Modul in ihr Unterrichtsprogramm aufnehmen. Die meisten Angebote sind in englischer Sprache, aber auch andere – vor allem europäische Sprachen – spielen eine Rolle. Mittlerweile gibt es bilinguale Angebote in fast allen Fächern, wobei die gesellschaftswissenschaftlichen Fächer wie z.B. Geschichte und Geographie nach wie vor dominieren. Überraschenderweise spielt das Fach Darstellendes Spiel in der Diskussion um potenziell geeignete bilinguale Fächer weder in der Theorie noch in der Praxis eine nennenswerte Rolle. Mit der Wahl dieses Themas für die vorliegende Dissertationsschrift wird der bilinguale Sachfachunterricht Darstellendes Spiel erstmals in das Blickfeld der Forschung gerückt. Damit werden sowohl dem Sachfach als auch dem bilingualen Unterricht neue Perspektiven eröffnet. In der vorliegenden Dissertation wird folgenden übergeordneten Fragestellungen nachgegangen: Wie kann das bilinguale Sachfach Darstellendes Spiel für die Sekundarstufen I und II der allgemeinbildenden Schulen konzipiert werden? Worin liegt das besondere Potenzial des bilingualen Sachfachunterrichts Darstellendes Spiel? Welches sind seine spezifischen Merkmale? Dabei soll aufgezeigt werden, wo und in welchem Maße der Einsatz der Fremdsprache die sachfachliche Arbeit positiv oder negativ beeinflusst bzw. welche Auswirkungen der Unterricht im Sachfach auf den Fremdsprachenerwerb hat. Zur Beantwortung dieser Fragen wurde eine Auswahl existierender Ansätze zum szenischen Spiel im Fremdsprachunterricht unter Einbeziehung allgemeiner Überlegungen zur Funktion von Theaterspiel analysiert und zu den Besonderheiten des bilingualen Sachfachunterrichts in Beziehung gesetzt. Das auf dieser Basis erstellte Konzept wird in seinen vielfältigen Potenzialen analysiert und ausgelotet und mit Hilfe eines Praxisbeispiels in englischer Sprache veranschaulicht. / The number of schools in Germany which offer to teach one or more subjects in a foreign language (content and language integrated learning = CLIL) is still growing. The subjects often chosen for this type of instruction are Geography and History. Other subjects are less frequently taught in a foreign language. The courses vary in length (a number of school years or only some weeks). Drama is very rarely chosen as a CLIL-subject, and there are hardly any reports of successful teaching of or scientific literature about CLIL Drama. This thesis puts CLIL Drama for the first time in the centre of scientific research, thus opening new prospects for Drama and CLIL. The main questions this thesis attempts to answer are the following: What could a concept for CLIL Drama look like for pupils at state schools aged between 13 and 18? How can the potential value added of CLIL Drama be described? What are its key features? This thesis also points to the advantages and disadvantages of CLIL Drama. In the search for an answer to the above questions the author has analysed existing approaches to teaching a foreign language (mainly English, but also German and French) with the help of drama, including the current German discussion about bilingual teaching at state schools. Furthermore, the author presents an alternative look into what theatre is about in this context. On the basis of the results of her research the author draws up a broad concept for CLIL Drama at German secondary schools. The thesis concludes with an illustration of a CLIL Drama project (in English) launched among 14-year-olds at a German gymnasium.