Basic life support (BLS) is a level of medical care which is used for victims of life-threatening illnesses or injuries until they can be given full medical care at a hospital. It can be provided by trained medical personnel, including emergency medical technicians, paramedics, and by qualified bystanders.
This was from the November 2015 Presentation by Charles Miller KF7VSH
A Flow Chart on CPR Click for a large view
A LARGE PDF from the AHA Guidelines Update for CPR and ECC