This requirement was removed mainly for two reasons: to ensure that students engage in meaningful activities and to decrease the amount of CAS fraud (i.e. claiming hours which have not been completed).
[citation needed] The function of CAS is to allow IB schools the opportunity to "give students the means to learn through experience [and] how to take actions in the service of others.
While individual schools or regions have different methods of documentation, all require some form of proof, often the signature of the supervisor of the experience, to be presented after its completion.
Some schools subscribe to online tools which include pages on which students can document their experiences and post reflections.
However, candidates are given another year to finish their CAS program if they fail, and if they complete it in this time they will receive their diploma.