What this research was about and why it is important Integrating content and language (ICL) has been a widely applied methodology of language learning and teaching in the last 20 years. However, ICL studies for first-year undergraduate students of science and engineering are scarce. This study examined perceptions of incoming students and professors who participated in ICL classes at a Korean science and engineering school. Most of the participants found the ICL classes helpful for students to develop a better understanding of content lectures and what to expect in regular content lectures. Also, many students found student-centered activities, consisting of group work, particularly motivating and effective. The study recommends a formula of ICL instruction for students entering a university with an EMI policy and concludes with suggestions for the successful implementation of ICL classes for content lectures in the areas of science and engineering. What the researchers did • This study investigated introductory ICL classes for incoming students at a science and engineering school in Korea. • Five introductory ICL classes in the areas of biology, physics, chemistry, programming and mathematics were implemented as part of a three-week intensive English camp for 121 incoming students. • Each ICL class consisted of pre-activities and post-activities in relation to a content lecture. • A 12-question survey was administered at the end of the post-activities for each respective subject in order to investigate students' perceptions of the ICL classes. • Follow-up email interviews were conducted with students, professors, and teaching assistants.