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The study involved the evaluation of anthropometric activities for high school science. The activities actively engaged students in the process of gathering, processing and analyzing data derived from human body measurements, with students using their prior knowledge acquired in science, mathematics and computer classes to interpret this information. Quantitative (survey) and qualitative (interview) methods were used to provide answers to the research questions. The quantitative portion of the study involved students' achievement, students' attitudes to science and students' perceptions of the classroom learning environment. A pretest/posttest design was used with achievement outcomes, however, only a single assessment of student attitudes and classroom environment was made. The sample size used to gather data on students' attitudes to science and students' perceptions of the leaming environment was 726 students. Five hundred and ninety-eight (598) students tools the biology test. However, analyses were restricted to the subsample of 158 students who had experienced the anthropometric laboratory activity. Twenty-four students (24) were interviewed for the qualitative part of the study. Data generated from the interviews were used to complement information provided in the surveys. The main purpose of this research was to evaluate these student-centered activities in terms of students' achievement, students' attitudes and students' perceptions of the science classroom environment. Other aims included: to validate generally-applicable measures of classroom learning environments and students' attitudes to science; to investigate gender differences in students' achievement, attitudes and perceptions of classroom environment; and to investigate associations between the classroom learning environment and the student outcomes of performance and attitudes.Some of the important findings of this study included: 1. In reference to the survey instruments, the item analyses suppo