I thought this was common knowledge...guess not...
Plea bargaining actually involves three areas of negotiation:
Charge Bargaining: This is a common and widely known form of plea. It involves a negotiation of the specific charges (counts) or crimes that the DEFENDANT will face at trial. Usually, in return for a plea of "guilty" to a lesser charge, a prosecutor will dismiss the higher or other charge(s) or counts. For example, in return for dismissing charges for first-degree murder, a prosecutor may accept a "guilty" plea for MANSLAUGHTER (subject to court approval).
Sentence Bargaining: Sentence bargaining involves the agreement to a plea of guilty (for the stated charge rather than a reduced charge) in return for a lighter sentence. It saves the prosecution the necessity of going through trial and proving its case. It provides the defendant with an opportunity for a lighter sentence.
Fact Bargaining: The least used negotiation involves an admission to certain facts ("stipulating "to the truth and existence of provable facts, thereby eliminating the need for the prosecutor to have to prove them) in return for an agreement not to introduce certain other facts into EVIDENCE.