This dissertation centers on the under-researched construct of interactional competence, which refers to features of jointly constructed discourse. When applied to the testing of speaking skills in a second language, interactional competence refers to features of the discourse that the two students produce together; rather than the speaking ability or performance of each person individually. This dissertation describes the construct of interactional competence in a low-stakes, paired speaking test setting targeted at students in their second year of German instruction at the college level. The purpose of this study is two-fold. First, the study analyzes the conversational resources that are co-constructed in the test discourse to maintain mutual understanding, which is considered the basis for interactional competence. Second, the study examines the impact of task (jigsaw task and discussion task) and speaking ability-level combination (same and different ability) in the test-taker pair on the co-constructed test discourse and thus on the deployment of the conversational resources to maintain intersubjectivity. In that respect, this study also seeks to analyze how the identified conversational resources are involved in establishing and negotiating language ability identities that are displayed in the test discourse. Conversation analytic conventions were used to investigate the interactional resources that test takers deploy to maintain mutual understanding. The procedures of repair (self-repair in response to other-initiated repair, inter-turn delays, and misunderstandings as well as other-repair in conjunction with word search activities) that emerged from the inductive analysis of the test discourse have broadened the conceptualization of interactional competence in the context of paired speaking assessments. Frequency distributions of the interactional resources were created to provide a better understanding of the impact of task and ability-level combination on the co-constructed repair procedures. The rationale behind this analysis is the general understanding of language testers that both resources and context influence test performance. The findings from the quantitative analysis suggest that there are more similarities than differences in repair use across the jigsaw task and the discussion task. In addition, even though some trends in the co-construction of repair procedures may be attributed to the higher or lower speaking ability of the test takers, the relationship between the ability-level combination in the pair and the use of repair seems to be rather variable. Finally, to learn more about the interrelationship between test takers’ speaking ability and interactional competence, this dissertation also approached speaking ability in terms of test takers’ co-constructed language ability identities that are displayed in the test discourse. By means of single case analyses, the study provided a detailed picture of the relationship between language ability identities and the procedures of repair, both of which are co-constructed at the discourse level. The findings from the conversation analysis show that the speaker who provides the repair is usually able to position himself or herself as the more competent or proficient speaker in the test discourse.

This dissertation consists of two studies, which respectively investigate L2 Chinese learners' acquisition of simple wh-questions of different grammatical functions longitudinally over their first-year learning and their acquisition of indirect questions and wh-questions in complements at the end of their first year. The participants consisted of 21 first-year English-speaking learners of Chinese. Both grammaticality judgment (GJ) and oral production (OP) tests were used. Study 1 reports that only attributive wh-questions posed more difficulty to the participants than object wh-questions in OP test at the beginning stage, and adverbial wh-questions and object wh-questions were not found to be significantly different to the participants as reported in some L1 and L2 studies. This author attributed this to the different syntactic mechanism that L2 learners of movement language and learners of in-situ language go through. The initial stage of participants' grammar did not display a clear presence of [+wh] feature strength, and the development of the [-wh] feature strength in learners' L2 grammar was not linear, but U-shaped. Study 2 reveals that learners' performance on indirect questions and wh-questions in object complements was not as good as their performance on simple wh-questions at the end of first year learning. For indirect questions, the initial stage of participants' L2 grammar showed an obvious L1 influence, the embedded [+wh]. For wh-questions in complements, it did not show an L1 influence, the matrix [+wh], but an embedded [+wh], which is non-target like but resembles wide-scope wh-questions with an embedded [+wh] in Malay and Madurese. Learners' performance on simple wh-questions patterned together with that in matrix clauses of wh-questions in complements, which was better than their performance on embedded clauses of the two types of complex wh-questions. Evidence for connection between their performance on simple wh-questions and matrix clauses of wh-questions in complements regarding the grammatical feature that wh-words are not allowed in clause initial position was revealed, but there was no strong evidence for connection between their performance on embedded clauses of the two types of complex wh-questions. It suggests that learners might be using different strategies for acquisition of structures of different natures.

Having acquired some degree of oral proficiency but low (or non-existent) literacy, the learning of Chinese heritage learners' (CHLs) learning needs are different from those of Chinese foreign language learners (CFLs), who have learned Chinese only in the classroom setting. Although researchers have advocated for a separate curriculum for CHLs, creating a heritage track may not be an option for many Chinese programs due to insufficient enrollment and limited resources. Huge proficiency variations among CHLs also make it difficult to provide a language curriculum that fits the needs of all learners. Therefore, CHLs are assigned to classes with CFLs in most Chinese language programs. From a pedagogical point of view, uneven proficiency levels are a great concern for instructors who teach a language class with students of different language backgrounds and with varying abilities, especially when assigning students to work in pairs or small groups. Although CHL-CFL paired interaction has become a common phenomenon in Chinese language classes, it has not been fully explored. Grounded in sociocultural theory, this research explores the nature of dyadic interaction between Chinese heritage learners (CHLs) and Chinese foreign language learners (CFLs) in a classroom setting. It investigates the roles that Chinese heritage learners and their foreign language peers play in paired discussions, how learners' proficiency gaps influence the dynamics of paired interaction, and whether peer-peer collaboration affects learners' individual oral performance. In this study, data were collected in three intermediate-level Chinese classes. Participants first filled out a language background survey to lead to a better understanding of the environments in which they use Chinese. Next, they took two proficiency tests to assess their comprehensive Chinese skills. Over the course of a semester, ten CHL-CFL pairs engaged in paired discussions on six different occasions. Before and after each pair work session, each participant was required to give an individual verbal report assessing the influence of paired interaction on his or her oral performance. After data from the six sessions were collected, participants took an end-of-study survey, which provides their perceptions about paired discussion and their roles in paired interaction over the research period. According to the findings, three interaction patterns (passive collaboration pattern, active collaboration pattern, and peer-tutoring pattern) were identified. The results of this study show that CHLs' language background and the amount of Chinese language exposure determined the CHL-CFL proficiency gaps in each pair, and further influenced the pattern of paired interaction. Learners generated more LREs (Language-related episodes) and were more likely to acquire knowledge from pair work when the degree of interaction mutuality was high. Even when the proficiency gaps were large, the less proficient learners still could transfer new knowledge to their independent work. To conclude, this study may be of importance in presenting the dynamics of CHL-CFL paired interaction in a mixed Chinese language class, as well as in providing instructors with a better understanding of how different factors such as interlocutors' proficiency gaps, individual participants' beliefs and attitudes relate to their interaction behaviors and subsequent independent performance.

This dissertation study was motivated by an interest in the process of acquisition of Russian vocabulary by a previously unstudied group of learners, American university students. The study identified the vocabulary learning strategies and beliefs about vocabulary learning of 97 university students beginning to study Russian. It also examined relationships between reported beliefs and strategies and their stability over the period of one semester of studying Russian. The data were collected with a self-report online questionnaire administered at the beginning and at the end of the Fall 2014 semester, as well as with interviews with the participants. Descriptive analysis of students’ beliefs indicated that the participants highly valued the role of vocabulary in studying a foreign language, understood the complexity of the process of vocabulary acquisition, and believed that words and phrases should be carefully studied and then practiced in context. The participants reported high motivation and high expectations of their success as learners of Russian. Descriptive analysis of vocabulary learning strategies demonstrated that besides active use of a dictionary, guessing, and note-taking strategies, virtually all participants reported frequent use of rehearsal strategies, especially repetition. These findings contradict the view that, in contrast to Asian learners of English, who are believed to value memorization and repetition, Western learners tend to downplay the role of repetition in the process of vocabulary learning. Analysis of the responses to open-ended questions and interview prompts confirmed that the participants frequently used repetition and rehearsal strategies and considered them most effective for establishing form–meaning connections for new words. The respondents also reported frequent use of contextual encoding, activation, and affective strategies. Comparison of the results of the two questionnaires revealed several vocabulary learning beliefs and strategies that underwent changes as a result of one semester of studying Russian. At the end of the semester students reported even more agreement with value of repetition, practice, good memory, and cultural knowledge for learning vocabulary. In contrast, they expressed significantly less agreement that it is easier to learn new words when they are presented in context. Besides, participants reported that while learning vocabulary they less frequently tried to recall sentences in which new words were used. Interviewed students explained this shift by noting the difficulty of Russian vocabulary and cognitive overload while trying to acquire new words in context. These findings once again argue against the claim that contextual acquisition of foreign language vocabulary is always effective in instructed foreign language learning. Using correlational and cluster analyses, the study identified multiple relationships between groups of vocabulary learning beliefs and strategies, as well as between individual beliefs and strategies. Motivational beliefs were correlated with most groups of vocabulary learning strategies, and memory strategies were correlated with most groups of beliefs.

This study investigates the strategies that learners of isiZulu use to understand and make themselves understood when they communicate in computer chatrooms. Chatrooms are viable tools for capturing linguistically rich interactions in conditions that are less restricted than the traditional classroom. The number and types of communication strategies that second language learners attempt, as well as their success in deploying them, have been a topic of interest to researchers in second language acquisition (SLA) because of their apparent role in the acquisition process. Strategies involve the efficient use of language to achieve successful communication in situations where there is some communicative deficiency, either in understanding or in self-expression. Examples of strategies are when learners ask for assistance from their chat partners, or when they check with their partners for confirmation of whether what they said is understood. This study explores differences in the strategies that intermediate learners of isiZulu use when the person they are chatting with is another isiZulu learner, compared to when their chat partner is a native speaker. The study also investigates whether the topic and type of interlocutor have any effect on communication strategy production. Eight learners were given cultural and personal topics to discuss alternately between their peers and native speakers. Given the tenet of the Interaction Hypothesis that language is best learned through interaction (Gass, 1997, 2003; Long, 1983, 1996), which is facilitated by communication strategies, exploring how strategies are utilized is important to the field of SLA as well as to African language pedagogy. The results of this study show no difference in the number, category and type of strategies used when chatting with peers versus native speakers about personal or cultural topics. The highest learners' use of CSs overall was to solve problems of self-expression when they chatted about cultural topics. This finding encourages the integration of culture and technology use in language classrooms. This study contributes to the small research base in technology and SLA for less commonly taught languages and, it is hoped, will promote the use of online chats and other communication technologies in the teaching of these languages.

The disproportionality of culturally and linguistically diverse learners in exceptional education is an ongoing issue (Bernal, 2002; Ford, 2012). One of these special populations is that of English learners (ELs), who are overrepresented in special education programs and underrepresented in gifted and talented programs (Ford, 2012).The extant literature suggests that a rapid rate of growth in English language proficiency (ELP) may be one of the characteristics used to indicate giftedness in English learners (Brulles, Castellano, & Laing, 2011; Harris, Plucker, Rapp, & Martinez, 2009). However, no studies have analyzed English Language proficiency (ELP) growth trajectories of gifted ELs. This study explored the growth in English language proficiency of 4,558 ELs, of which 118 were identified as gifted. Scores from the Comprehensive English Language Learning Assessment (CELLA), were used to determine their typical English language proficiency growth trajectories of ELs. This was done using latent growth curve modeling. The growth trajectories were then analyzed to determine if differences existed in the trajectories of ELs identified as gifted. The findings were that differences did exist in the English language proficiency growth of ELs identified as gifted, particularly in the areas of listening/speaking and writing, where gifted ELs seem to grow at a more rapid rate than their non-identified peers.

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