This paper describes a phenomenographic study of undergraduates' experiences of information literacy when researching an essay in a first-year environmental studies course. Three hierarchical categories were identified that represented students' experiences: (i) seeking evidence; (ii) developing an argument; and (iii) learning as a social responsibility. The critical variation that delimited the categories included students' focus on learning, focus on the essay task, use of information in the course, use of information in the essay, use of contrasting perspectives and development of argument. Strategies for designing curricula are suggested based on the educationally critical aspects that the study reveals, and the nature of information literacy as a "generic" skill is questioned. The study has significance for students, teachers, librarians, academic skills advisers and academic developers in higher education. (Contains 3 tables and 5 figures.)