Creativity, activity, service (CAS) is one of the three essential elements that every IB Diploma candidate must complete as part of the Diploma Programme (DP).

Studied throughout the Diploma Programme, CAS involves students in a range of activities alongside their academic studies.

Students reflect on their CAS experiences as part of the DP, and provide evidence of achieving the learning outcomes for CAS.

CAS Projects Guidance

NHS CAS Coordinators: Julie Tyrrell & Rhonda Tucker

Phone: 303-652 2550 Ext. 46513


The extended essay is an independent, self-directed piece of research, finishing with a 4,000-word paper.

One component of the International Baccalaureate® (IB) Diploma Programme (DP) core, the extended essay is mandatory for all students.

Example Extended Essays

NHS EE Coordinator: Beth Lozen
Phone: 303-652-2550 Ext. 46624


Theory of knowledge (TOK) is assessed through an oral presentation and a 1,600 word essay.

It asks students to reflect on the nature of knowledge, and on how we know what we claim to know.

TOK is part of the International Baccalaureate® (IB) Diploma Programme (DP) core, and is mandatory for all students

Example TOK Essays

NHS TOK Instructors: 

Kelly Yazzie
Phone: 303-652 2550 Ext. 46586

Michael Rees
Phone: 303-652 2550 Ext. 46640