Current policy and research have led the field of science education towards a model of "science as practice." In the past decade, several research programs on model-based reasoning practices in education have articulated key dimensions of practice, including constructing and defending models, comparing models to empirical data, using representations to identify patterns in data and use those as inscriptions to buttress arguments. This study presents a detailed case of how the use of a physical microcosm and children's self-directed representations of an ecosystem constrained and afforded student sense-making in an urban elementary classroom. The case analyzed the experiences of a 10-year old fifth grade student, Jorge, and the variation in his expressed understanding of ecosystems as he interacted with academic tasks, along with models and representations, to design, observe and explain an ecological microcosm. The study used a conceptual framework that brings together theories of situated cognition and Doyle's work on academic task to explain how and why Jorge's perception and communication of dimensions of ecosystem structure, function, and behavior appear to "come in and out of focus," influenced by the affordances of the tools and resources available, the academic task as given by the teacher, and Jorge's own experiences and knowledge of phenomena related to ecosystems. Findings from this study suggest that elementary students' ability or inability to address particular ecological concepts in a given task relate less to gaps in their understanding and more to the structure of academic tasks and learning contexts. The process of a student interacting with curriculum follows a dynamic trajectory and leads to emergent outcomes. As a result of the complex interactions of task, tools, and his own interests and agency, Jorge's attunement to the role of water in ecosystems comes in and out of focus throughout the unit. The instructional constraint of needing to integrate the FOSS Water Cycle curriculum into the Bottle Biology Project became an affordance for Jorge to ask questions, observe, and theorize about the role of water and the water cycle in an ecosystem. The practice of modeling a closed ecosystem made salient to Jorge the boundaries of a system and the conservation of water within that system. The closed ecosystem model also presented constraints to students' sense making about the role of interactions when students lack domain knowledge in ecology. Relying on students' own talk, photographs and representations as explanations of phenomena in the Bio Bottle, without establishing norms of representational conventions and communication, resulted in missed opportunities for Jorge to reinforce his sense making during the activity and to develop conventions of scientific representation. Findings from this study can be used to inform the design and implementation of learning environments and curricular activities for elementary and middle school students that address all three dimensions of the Next Generation Science Standards: a) developing conceptual understanding of key concepts in the domain of ecology, b) the cross-cutting concept of systems, and c) multiple practices that ecologists use in developing and evaluating models that explain ecosystem structures, functions, and change over time.

The education of emergent bilinguals in the United States is overtly and covertly shaped by social, political, and institutional ideologies about languages and speakers of languages other than English. Using a multiple case study design, this study sought to explicate the often-complicated intersection of outsider institutional and societal ideologies with the insider lived experiences of emergent bilinguals in schools. The population of the school under study uniquely positioned emergent bilinguals as not only the linguistic minority but also the numeric minority, a population dynamic notably underrepresented in the literature. Using a positioning theory framework that focused on the normative constraints that support meaning making during social interactions, this study explored how primarily monolingual English-speaking teachers and peers interactionally positioned three fourth grade emergent bilinguals, as well as how these emergent bilinguals reflexively positioned themselves. Data collection efforts consisted of multiphase observations of classrooms including the creating of sociograms and fieldnotes, interviews with emergent bilinguals, teachers, and key peers, as well as a localized artifact analysis. Findings suggested that the emergent bilinguals unique backgrounds contributed to their variable reflexive positioning, as well as teachers' variable interactional positioning. Additionally, peer positioning and institutional norms contributed to emergent bilinguals having limited access to academic language development opportunities.

This qualitative study is an exploratory look at family experiences at night time telescope observing events, often called star parties. Four families participated in this study which looked at their expectations, experiences and agendas as well as the roles that identity and family culture played in the negotiation of meaning. Two families who had prior experience with attending star parties were recruited ahead of time and two other families who were first time visitors were recruited on-site at the observing event. Data were collected at two star parties. At each event, one experienced family was paired with an on-site family for the purposes of facilitating conversations about expectations and prior experiences.The results of this study showed that learning is constantly occurring among families, and that star parties and family culture were mediational means for making meaning. Expectations and agendas were found to affect the families' star party experiences and differences were observed between the expectations and experiences of families based on their prior experiences with star parties. These data also showed that family members are actively negotiating their individual and family identities. These families use their cultural history together to make sense of their star party experiences; however, the meaning that families were negotiating was often focused more on developing family and individual identity rather than science content. The families in this study used the star party context as a way to connect with each other, to make sense of their prior experiences, and as raw material for making sense of future experiences.

Student difficulties learning algebra are well documented. Many mathematics education researchers (e.g., Bednarz&Janvier, 1996; Davis, 1985, 1989; Vergnaud, 1988) argued that the difficulties students encounter in algebra arose when students were expected to shift suddenly from arithmetic to algebraic reasoning and that the solution to the problem was to integrate opportunities for elementary school students to simultaneously develop both arithmetic and algebraic reasoning. The process of generalization, or describing the overall pattern underlying a set of mathematical data, emerged as a focal point for extending beyond arithmetic reasoning to algebraic reasoning (Kaput, 1998; Mason, 1996). Given the critical importance for students to have opportunities to develop understanding of the fundamental algebraic concepts of variable and relationship, one could argue that providing opportunities to explore linear functions, the first function studied in depth in a formal algebra course, should be a priority for elementary students in grades 4-5. This study informs this debate by providing data about connections between different representations of constant growth functions and student algebraic reasoning in a context open to individual construction of representations and reasoning approaches. Participants included 9 fifth graders from the same elementary class. Data shows that students can generate representations which are effective reasoning tools for finding particular cases of the function and generalizing the function but that this depends on features of the problem representation, most importantly the representation of the additive constant. I identified four categories of algebraic reasoning on the task to find the tenth term and found that only students who used reasoning approaches with the additive constant separate and functional reasoning to find the variable component were able to generalize the function. These instances occurred on a story problem and two geometric pattern problems. None of the students used such a reasoning approach or were able to generalize on the numeric sequence problem which did not represent the additive constant separately. Implications for future research and for teaching for conceptual understanding of variable and relationship are discussed.

In 2010 the Texas Education Agency adopted newly rewritten curriculum standards for the state's social studies courses K-12. The period leading up to the adoption of the standards proved contentious as the new standards moved out of the writing committees and into the public realm. The issues brought forth from initial readings of the standards appeared in the national spotlight as educators and the general public from around the country voiced their concerns. Many concerns centered on the belief that the Texas State Board of Education had rewritten the standards to reflect a more politically conservative world view along with an emphasis on traditional Judeo-Christian beliefs. Members of the state board argued that the previous standards reflected a politically liberal world view and that the board needed to bring balance to the standards. Because of national criticism changes were made but on a limited scale. The purpose of this study was to assess if the rewritten standards demonstrated a politically conservative preference as well as an emphasis on Judeo-Christian beliefs. During the analysis I included information regarding a preference for capitalism, a focus on Texas and U.S. history while minimizing world history and a focus on memorization rather than critical thinking. The analysis revealed that the rewritten standards demonstrate a politically conservative leaning while promoting traditional Judeo-Christian beliefs. Analysis and research further revealed that the standards promote capitalism while limiting the study of other economic systems in the world. In regards to the preference for Texas and U.S. history versus world history my analysis confirmed a limited presence of world history; however, research also revealed that this issue is not limited to the state of Texas, but a number of other states in the U.S. Finally, my analysis demonstrated that many of the standards' objectives begin with verbs found on verb lists from Bloom's Taxonomy. By using Bloom's Taxonomy I learned that a majority of objectives throughout the K-12 standards operate in the lower half of the Taxonomy rather than the upper half meaning that there is an emphasis on lower order thinking skills rather than higher order thinking skills.

The focus of this research is to understand how different factors, such as state-level EE policies and institutional values, influence the inclusion of environmental education (EE) into pre-service teacher preparation programs. Institutional theory is the main theoretical foundation used for analyzing this issue. This is a mixed methods study with a sequential triangulation design (Morse 1991), using quantitative data from 50 states and 191 public universities to guide the selection process for seven qualitative interviews. While the impact of EE policies is evident, understanding the mechanisms that contribute to such things as political capital and how institutional value for EE is created is more nuanced. The findings from this research point to targeted EE policies, collaborative practices, and research on the development of institutional culture as strategies to bring EE in from the fringes of pre-service teacher preparation programs.

This dissertation sought to better understand the K-12 school experiences of middle and upper income Blacks educated in predominantly White and integrated suburban school systems. Through the narratives of six (6) participants—four females and two males (split evenly between Generations Y and Z)—the study contributes toward knowledge on African American within-group differences and perspectives on K-12 school experiences. The theoretical frames of social location and trust were used to help guide this investigation. Through social location, I sought to understand the interconnectedness of one's race, class, and gender and how these locations impact school experiences. Through the theoretical frame of trust, I sought to understand "overall" participant confidence in the educational processes (academic and social) they underwent. While findings from this dissertation matched some of what is already well-documented on the K-12 school experiences of Black American students in general, by focusing on within-group differences relevant to class and generational grouping, key variances in experiences (not often reported) were revealed. For example, as the study was intergenerational in scope, there was a clear generational divide among study participants in terms of their views relating to how race impacted their K-12 school experiences. Despite the fact that most felt that their schools were not sensitive to their needs as African Americans, race seemed to be less of a concern with Gen Z'ers than with Gen Y'ers. More specifically, while participants from Generation Y were explicit in stating that race had an impact on their school experiences, Generation Z was hesitant to say that race influenced their experiences. Interestingly, as all participants dealt with racial stereotyping, the biggest perpetrators of such stereotypes were peers and not educators. The influence of socioeconomic class on school experiences was also significant as most participants felt that their economic status influenced their cross-cultural interactions. In addition, while the social location of gender was not heavily emphasized in this dissertation, there were variations in perspectives stratified across gender lines. Taken together, a major conclusion was that one's social location (inclusive of generational grouping) cannot be ignored when taking into account the academic experiences of African American students as a whole. Finally, this dissertation highlighted the overall confidence each participant had in the educational process they experienced (academically and socially). Although all encountered some tough circumstances directly related to their social location, everyone felt positive overall about their school experiences—perceiving the academic training they received and inter-ethnic social interactions, as an asset.

The process of generalization in mathematics was identified by mathematics education and educational psychology research, out of many mental actions or operations, as a cognitive function fundamentally required in the thinking process. Moreover, the current changes in education in the United States bring forward the dual goal of mathematics teaching and learning: students should have strong and rigorous mathematical content knowledge and students should be involved in practices that define the status of doing mathematical work. This dual role is totally dependent on the process of generalization. This study uses theories and research findings from the field of algebraic thinking, teaching, and learning to understand how the third grade teacher’s edition textbooks of three mathematics curricula portray the process of generalization. I started my study with the development of a theoretical coding system obtained by combining Kaput’s theory about algebra (Kaput, 2008), Krutetskii’s two way of generalization (Krutetskii, 1976), and the five mathematical representations identified by Lesh, Post, and Behr (1987). Then, I used the coding system to identify tasks that have the potential to involve students in the process of generalization. The findings from my study provide evidence that following a well-structured theory, such as Kaput’s theory about algebra, allows us to identify tasks that support algebraic thinking and to create new ones with higher potential to involve children in the process of generalization. Such tasks may support the development of algebraic thinking as a continuous process that should start from early grades of elementary school.

This study was an investigation of mentor teachers who work in a Master of Education teacher preparation program. It examined mentors who work with teacher candidates to understand their conceptualization of their purpose in teacher education. The teacher preparation program that was the site of this study placed teacher candidates in the classroom for a year-long field experience aligned with the actual teaching calendar in schools and reflective of the clinical-based preparation called for by the National Council for Accreditation of Teacher Education (NCATE, 2010). Attention to teacher preparation program outcomes has increased significantly in the past few years (Council for the Accreditation of Educator Preparation, 2013; Council of Chief State School Officers, 2013; Greenburg, Pomerance, & Walsh, NCTQ, 2011; NCATE, 2010). Within this focused interest on program outcomes and on the impact well-prepared teachers make on school improvement, field placements are viewed as more essential in the preparation of teacher candidates (Bullough, Draper, Smith, & Birrell, 2004; Korthagen, 2004; Valencia, Martin, Place, & Grossman, 2009; Zeichner, 2010). Therefore, because mentor teachers affect teacher candidates in the field, it is crucial to understand how mentor teachers conceive their role and purpose within teacher preparation, and how they can be supported prior to assuming this responsibility and throughout the time they spend with the teacher candidates. The dissertation research was divided into two major phases: Phase One was a survey administered to all mentor teachers who work with the program (n=54) early in spring, 2014. The analysis of the survey provided the data necessary to use purposeful sampling to select mentors who reported a commitment to diverse mentoring practices. Data was collected on the interview sample (n=6) in Phase Two through interviews and observations to document and analyze how mentors enacted practices that may or may not be consistent with their perceived purpose and role or with the existing literature on mentoring teacher candidates. Considering the importance of this mentoring relationship on the teacher candidates' preparation outcomes, identification of the approaches to mentoring that can be strengthened by preparation are important in order to emphasized these points as part of the development of partnerships that will strengthen the mentoring system. This research offered insight for teacher preparation programs relating to how mentors internalize their role and areas for development that may align mentoring practices with the educative functions that develop responsive teachers. The findings of this study offered suggestions for preparation that target the mentors' professional growth through collaborative and ongoing instructional and personal support.

Grounded in Freire's (1970) notion that the purpose of education in an unjust society is to bring about equality and justice, Critical Mathematics (CM) scholars consider mathematics to be a tool to understand, critique, and change the world by deconstructing power structures that marginalize certain groups. In particular, Gutstein's (2006) framework for integrating students' Community, Critical, and Classical mathematics knowledge bases (3 Cs) advocates for mathematics instruction that incorporates students' informal and everyday experiences. This involves investigations into social phenomena that draw on students' perspectives and experiences to inform critical analysis, while developing mathematical power. This dissertation presents the findings from a critical ethnographic study of a veteran teacher of color's approach to integrating the 3 Cs in his Precalculus class. In addition to discussing the creation and implementation of CM activities, this study examined the perspectives and participation of students of color during these curricular units. Data from 12 students of color, including interviews, focus groups, classroom observations, and student work, were collected over the course of a school year. Detailed descriptions are presented of three CM activities (i.e., Local Poverty Unit, AIDS Lab, Gini Coefficient Unit).Analysis of student participation found that students engaged most fully when units integrated transparent mathematical concepts into non-traditional social investigations. CM activities that lacked mathematical activity and/or reproduced traditional instructional norms resulted in high levels of open and passive resistance. Analysis of student perspectives found that repeated opportunities to integrate the 3 Cs promoted shifts in students' orientation toward mathematics. Some students came to see new ways of learning and using mathematics that included various means of participation and connections to one's personal life. In the end, students recognized that mathematics could be relevant and powerful for making sense of the world (reading the world), and acknowledged its potential for bringing about change (writing the world). Findings point to the essential role personalization plays in helping students develop a sense of social agency. That is, by prioritizing Community knowledge and inviting students to incorporate personal and family stories, teachers promote students' integration of their personal perspectives and experiences into their critical analyses.