Critical thinking is a crucial skill that students need to develop while at university. It is important for a well-educated person to be able to make well-informed judgements, be able to explain their reasoning and be able to solve unknown problems. This paper proposes that critical thinking can and should be developed from the first year of university in order for students to cope with their future studies and to be of most use to future employers. The paper then describes four exercises that can be used to develop critical thinking in first year students.