“All Diploma Programme students participate in the three elements that make up the core of the programme model. Reflection on all these elements is a principle that lies at the heart of the thinking behind the Diploma Programme.
The theory of knowledge course encourages students to think about the nature of knowledge, to reflect on the process of learning in all the subjects they study as part of their Diploma Programme course, and to make connections across them. The extended essay, a substantial piece of writing of up to 4,000 words, enables students to investigate a topic of special interest that they have chosen themselves. It also encourages them to develop the skills of independent research that will be expected at university. Creativity, action, service (CAS) involves students in experiential learning through a range of artistic, sporting, physical and service activities.”
— Theory of Knowledge Guide, p 3.