
All the portions (Creativity, Action, and Service) are vaguely defined and should, according to the IBO, be interpreted as imaginatively as possible, so that a wide array of different activities can qualify for CAS. As the total required amount of hours is 150, and as they should be equally divided between the three portions, there is a de facto requirement of at least fifty hours each.
While individual schools or regions have different methods of documentation, all require some form of proof or the signature of the activity coordinator to be presented after completion of the activity. Students must also personally keep track of their total records in either a log or "diary" format. This allows for students to monitor their required hours and to present a coherent documentation of their entire CAS experience. Students have thus far achieved many things while working for their CAS credits, an example of this is the creation of a Hong Kong based website enabling other students to easily find places where CAS activities can be found.
CAS is not assessed, but a failure to complete and report the full 150 hours is a failing condition for the IB Diploma. However, the candidate has over one year to make up the 150 hours following the end of the school year to receive the diploma. Those not doing the full IB Diploma but instead the associate program in view of obtaining the IB certificate are only required to have 150 CAS hours.
More information on the IB program and its CAS components can be found at
Like Extended Essay and Theory of Knowledge