ACLS documentation is revised every 5 years based on current research. Every year, the International Liaison Committee on Resuscitation (ILCOR) evaluates the most current scientific evidence and provides brief updates to the ACLS guidelines. This review ensures that scientific research steers the ACLS guidelines without having to wait 5 years until a full revision is complete. An ACLS responder must maintain an up-to-date knowledge base from the most current guidelines.