This paper considers curriculum integration in the secondary school context and investigates the claims made that it can enhance learning outcomes for students. I argue that curriculum integration should be utilized not as a main means of curricular delivery but as a supplementary opportunity to put disciplinary knowledge to use in certain, well-planned contexts. In other words, disciplinary learning comes first and is then deepened through application in an interdisciplinary context. This argument is illustrated through a case study of a new "21st Century" secondary school where interdisciplinarity is a cornerstone of the school's philosophy. Methods for the study included weekly observations, interviews, focus groups and a survey. I conclude by suggesting that teachers require further time and assistance to develop programmes and evaluative criteria to ensure learning moves beyond thematically generated common sense knowledge, towards interdisciplinary insights.