This thesis is significant in that it is one of the first evaluations of a computer classroom psychosocial learning environment and investigation of associations between learning environment factors and students' attitudes at the tertiary level in Thailand. Both quantitative and qualitative methods were used in this study. Three questionnaires were employed to provide quantitative data: the College and University Classroom Environment Inventory (CUCEI), the Computer Laboratory Environment Inventory (CLEI), and the Attitude towards Computer and Computer Courses (ACCC). The three questionnaires were administered to 905 computer science students in order to investigate their perceptions of their learning environment and associations between this and their attitudinal outcomes. Overall, the results generated from scale internal reliability analysis, mean correlations and ANOVAs suggested that the modified Thai versions of the CUCEI, CLEl, and ACCC are valid and reliable instruments for measuring students' perceptions of computing laboratory learning environments in a Thailand university. The results of an application of the CUCEI and CLEI demonstrated that students had positiveperceptions about their computer classroom learning environment. The qualitative data obtained from student interviews supported the information from questionnaires and provided more detail about the computer classrooms. Measurements of students' attitudes indicated that students enjoyed their classes and thought they were useful. Regarding associations between students' attitudes and perceptions of the computer classroom, most scales of the Thai CUCEI and CLEI, were statistically significantly positively associated with the four scales of the Thai version of the ACCC. Importantly, there were significant negative correlations between scales of the CUCEI, and CLEI with the Anxiety scale.

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High attrition rates in Science, Technology, Engineering, and Mathematics (STEM) fields are major challenges in undergraduate education. Many students enrolled in STEM fields end up switching their majors to non-STEM fields or leave college without earning any academic qualification. Due to these reasons, the United States is facing a critical shortage of future talented STEM personnel in the domestic workforce. Therefore, graduating a sufficient number of talented students in STEM fields has come to national attention. It is important to examine strategies for improving STEM-major retention and undergraduate education in STEM disciplines. The main purpose of this study was to investigate methods to improve students’ social and peer-mentoring interactions within the undergraduate chemistry program at Mississippi State University to improve student learning and their attachment to chemistry and the STEM major. In Chapter II, a study performed to examine peer-mentoring interaction patterns that occur between laboratory partners in the General Chemistry I laboratories is discussed. In this study, five different laboratory partnership types were created. In the development of some partnership types, Math ACT score and lecture section were used as metrics for matching lab partners to create supportive peer-mentoring interactions. Also, students were encouraged to participate in external study groups during the semester. This research study determines whether valued peer-mentoring interactions in the laboratory could support students to be more successful in their chemistry coursework and to have improved social interactions. In Chapter III, a peer review writing assignment that mimics the publication process is presented. This writing assignment supports students to improve their writing skills by reviewing peer write-ups and practicing critical analysis of their work. This assignment is introduced to upper-level undergraduate students to improve their scientific literacy skills in order to prepare them for future scientific communication. In Chapters IV and V, two new laboratory experiments that are connected to real-life scenarios are presented. These laboratory experiments are designed to improve student interest in laboratory learning and to enhance their learning in chromatography techniques and hands-on experience with the GC-MS instrument.

The learning environment has been the focus of considerable educational research over a long period of time. The study reported in this thesis utilises the perceptions of 208 junior science students from a North Queensland state secondary school to inform classroom environment improvement plans developed and implemented by their teachers' in an attempt to improve the cognitive and attitudinal outcomes of the students. The five stage process on which the study is based combines theory and practice in providing the participating teachers with a structured means of bringing about change in their classrooms. Students' perceptions of actual and preferred teacher interpersonal behaviour and the laboratory learning environment are measured using the QTI and SLEI respectively. Particular aspects of teacher interpersonal behaviour and the laboratory learning environment are targeted for change through the classroom environment improvement plans. The study identified which aspects of the learning environment had changed after a period of intervention. It also identified associations between students' perceptions of aspects of their laboratory learning environment and attitudinal outcomes as well as associations between teacher interpersonal behaviours and attitudinal outcomes. While no direct associations were found between aspects of the laboratory learning environment or teacher interpersonal behaviours and cognitive outcomes, students' cognitive outcomes did improve over the duration of the study thus supporting a previously established link between student attitudes and cognitive outcomes.

The purposes of this study were to analyse the learning environment, teacher-student interactions and educational outcomes in physical chemistry laboratory classrooms inThailand. In addition, the validation of the Chemistry Laboratory EnvironmentInventory (CLEI), the Questionnaire on Teacher Interaction (QTI) and Attitude Scale was examined. The sample was composed of 100 physical chemistry students in four Rajabhat Universities who responded to both Actual and Preferred Forms of the CLEI and QTI. Also, interviews and written stories were used with twelve students.Students' learning outcomes were investigated using a cognitive test, a practical test and the Attitude Scale. Before the questionnaires were used with the 100 students sample, the reliability and validity of the CLEI, QTI and Attitude Scale were confirmed with 198 tertiary science students in seven Rajabhat Universities. In addition, the results of students' interviews and written stories supported the validityof both the CLEI and QTI, and students improved their achievement outcomes. Thestudy found that there were differences between the students' preferred learningenvironments and what they perceived to be actually present. Associations were also found between students' perceptions of the classroom environment and student outcomes.