Remedial/developmental and introductory university mathematics courses have a long history of high attrition rates. Recently, university administration and mathematics departments have been considering technological solutions, and one such solution is computer-adaptive-instruction (CAI). In fact, CAI has been touted as a "silver bullet"…

High level reading comprehension is a process that results in a reader's semantic interpretation of a text, or mental model of that text, referred to as the "reader's situation model." Individual differences in readers' verbal working memory resources, as measured by reading span tasks (RST), and operation span tasks (OST), have shown to…

Skill acquisition theorists conceptualize second language (L2) learning as the acquisition of a set of perceptual, cognitive, and motor skills. The dominant view in skill acquisition theory is to regard L2 skill acquisition as a three-stage process "from initial representation of knowledge through initial changes in behavior to eventual…

This dissertation studies different social factors that affect students' cognitive, non-cognitive skills, and behaviors. The first chapter provides evidence on the immediate effects of exposure to violent crimes on academic performance and externalizing behaviors among high school students. I find that exposure to violent crimes decreases PSAT,…

This mixed methods study investigates the effect of cultural and sociolinguistic textures of talk on authentic discussion patterns and whether reading comprehension and inferencing are affected in an online booktalk environment with adolescents. The research will also investigate the contextual features of the classroom community to be studied to…

The purpose of this study was to examine the use of heuristics by students and gain insight into the thought process behind their problem-solving skills. The study used an adaptive narrative as the information delivery medium. An adaptive narrative was chosen because it could be designed to simulate decision making processes encountered in real…

This study examines the impact of problem posing on developmental mathematics students. Currently, students enter post-secondary institutions underprepared for college mathematics and are required to take developmental mathematics courses. Given their past challenges with mathematics, the students tend to have negative beliefs and attitudes toward…

The purpose of this study was to establish the reliability and validity of the construct map for students' conception of equivalence with special emphasis on investigating the impact of structure of equation on students' conception of equivalence. The study examined the role of structure of equations in identifying students' conception of…

Researchers and instructors have only recently embraced the role of errors as vehicles for learning in the algebra classroom. Studying a mixture of correct and incorrect worked examples has been shown to be beneficial relative to correct worked examples alone. This study examines the effectiveness of having students generate, or anticipate, errors…

At Haverford High School, a suburban high school in Haverford, Pennsylvania, a mathematical achievement gap exists for economically disadvantaged, special education, and Black students. Researchers have found that students in lower tracked classes often receive less rigorous tasks, tasks with lower cognitive demand, and fewer tasks that focus on…

Visual categorization is ubiquitous in many professions, yet training programs are typically time- and effort-intensive. This work focuses on developing methods to improve human learning and performance on challenging visual categorization tasks, e.g., bird species identification, diagnostic dermatology. As part of the general approach, we infer…

This study investigated the cognitive factors that impact the completion of mathematics problems, specifically algebraic-reasoning, by individuals who use tactile materials (i.e., braille) compared to those who use print materials. The inquiry investigated working memory, task time, cognitive load, efficiency, and the predictive quality of…

Gulf-War-era-II combat veterans have made professional contributions to the civilian workforce since returning from Iraq and Afghanistan combat operations. Service members in California encounter transition issues related to employment and adjusting their self-identity in the civilian employment culture. These complexities have led to career…

The purpose of this study was to challenge autonomous views of writing and deficit views of students who struggle with school literacy. This study is an exploration of students' use of social, linguistic, and cognitive resources to construct meaning in narrative writing events in school. The following research questions guided this inquiry: What…

This three-paper dissertation was conducted to explore how motivation and engagement, in addition to cognitive aspects, should be considered in disciplinary literacy instruction and assessment in high school classrooms. The studies, which were based on a five-year collaborative school-university partnership, were conducted to explore the relation…