A variant of parole is known as "time off for good behavior", or, colloquially, "good time". Unlike the traditional form of parolewhich may be granted or denied at the discretion of a parole boardtime off for good behavior is automatic absent a certain number (or gravity) of infractions committed by a convict while incarcerated (in most jurisdictions the released inmate is placed under the supervision of a parole officer for a certain amount of time after being so released). In some cases "good time" can reduce the original sentence by as much as one-third. It is usually not made available to inmates serving life sentences, as there is no release date that can be moved up.