Students' conceptions and beliefs about learning are constructs that have been proposed in two independent lines of research, phenomenographic and metacognitive, and analysed using qualitative and quantitative methodologies, respectively. The present research examines and integrates in a single study both constructs and methodologies. Data were collected through an open-ended task (Tynjala, 1997) and an epistemological questionnaire (Schommer, 1990), administered to a sample of 1,200 secondary students. Three major statistically significant findings emerged. First, students' conceptions of learning and epistemological beliefs changed from simplistic to more complex as they progressed through school. Second, the two constructs were linked to each other. The most advanced category on the "dimension of depth" of learning conceptions corresponded to the highest scores at the complex pole of the belief system. Third, learning conceptions as well as epistemological beliefs were predictors of academic performance. The more capable students were of constructing meaning, the better their academic achievement appeared to be. Theoretical and educational implications are discussed with regard to further research, classroom instruction, and the value of combining both research methodologies in order to deepen our understanding of students' learning experience. (Contains 3 figures and 3 tables.)