OPINION OF THE COURT
FLAHERTY, Justice.On October 31, 1987 Anderson shot Norma DeBooth in the neck as she stood at the kitchen sink preparing dinner. She is now a quadriplegic. Anderson was tried by a jury in the Court of Common Pleas of Berks County, Criminal Division, and was convicted of aggravated assault, criminal attempt to *576murder, and possession of an instrument of crime.1 He was sentenced to consecutive terms of four to eight years for attempted murder; six to twelve years for aggravated assault and one to two years for possession of an instrument of crime.
On direct appeal, Superior Court en banc affirmed the judgments of sentence, holding that aggravated assault committed by inflicting serious bodily injury is not a lesser included offense of criminal attempt to murder because the two crimes require distinct mental states, and because injury is not an element of attempted murder, although it is an element of this type of aggravated assault. 416 Pa.Super. 203, 610 A.2d 1042. The dissent argued that because aggravated assault is a lesser included offense of attempted murder and because the crimes arose from a single act, Anderson’s criminal act is not punishable by multiple sentences.
We granted allocatur to address the question of whether the crimes of attempted murder and aggravated assault merge for sentencing purposes.
The question of when sentences should merge is not an easy problem, and it excites the advocacy of those favoring stricter against those who favor more lenient sentences. Analytically, the problem concerns whether a single criminal plan, scheme, transaction or encounter, which may or may not include many *577criminal acts, may constitute more than one crime, and if it may constitute several crimes, whether each criminal conviction may be punished separately or whether the sentences merge.
Generally, the doctrine of merger is a rule of statutory construction designed to determine whether the legislature intended for the punishment of one offense to encompass that for another offense arising from the same criminal act or transaction. If the legislature were to tell us that crime A merges into crime B, the problem would not arise, for the legislative intent would be manifest. It is in cases where the legislature has not given direction that we must devise a rule.
Five years ago we fashioned a merger doctrine in the cases of Commonwealth v. Williams, 521 Pa. 556, 559 A.2d 25 (1989) and Commonwealth v. Weakland, 521 Pa. 353, 555 A.2d 1228 (1989). In Williams, the criminal attacked a 61-year-old woman who was walking her dog. He grabbed her from behind, choked her and threw her to the ground, beat her and attempted to rob her. Williams was convicted and sentenced on aggravated assault, criminal attempt at robbery and unlawful restraint. Superior Court determined that this attack was one successive criminal act. Working with that description of the facts, we addressed the question of whether one criminal act can spawn multiple convictions and sentences. We answered that it could so long as sentences are not imposed for both greater and lesser included offenses.
In Weakland, the criminal was convicted and sentenced on a number of crimes, including, inter alia, murder, robbery, criminal conspiracy, kidnapping, aggravated assault, and theft in a criminal episode in which Weakland and his brother robbed a filling station. During the robbery, Weakland murdered the station owner, assaulted the owner’s wife, and attacked a customer in the course of trying to escape. He struck the customer with a gun, held him at gunpoint, and forced him to drive Weakland away from the robbery-murder scene. The merger issue in the case concerning this customer-victim was whether the assault in striking the customer with the gun merged into the kidnapping conviction for sentencing pur*578poses. We held that it did not because the force requirement of kidnapping was supplied by holding the customer at gunpoint, not by the assault, and the assault was, therefore, a separate crime.
We summarized he holdings of these two cases in Weakland as follows:
In Leon Williams we held that where the same facts are used to support convictions for crimes having different elements, the crimes do not merge for sentencing purposes, unless the same facts support convictions of lesser included offenses. That holding does not apply to the present case [Weakland ] because the problem here is not whether the same facts support multiple convictions, but whether facts in evidence additional to those facts establish aggravated assault, i.e., that James Weakland continued to threaten Mr. Wilson with a handgun, should have been used to satisfy the threat or force requirement of kidnapping. It is our view that the additional facts should be used to satisfy the force or threat element of kidnapping, for otherwise a violent criminal would be permitted to perpetrate multiple crimes while suffering 'only partial liability for the harm he has wrought.
For the foregoing reasons, we hold that if a person commits one act of criminal violence, and that act is the only basis upon which he may be convicted of another crime, the act will merge into the other crime. If, however, the actor commits multiple criminal acts beyond that which is necessary to establish the bare elements of the additional crime, then the actor will be guilty of multiple crimes which do not merge for sentencing purposes.
521 Pa. at 364-65, 555 A.2d at 1233.
What we intended by this was that when a person is convicted of several crimes based on the same facts, the sentences for those crimes will not merge unless the crimes are greater and lesser included offenses (Williams), and this rule is modified by the requirement that if the person commits only one act of criminal violence, but is convicted of several *579crimes based on this solitary act, the sentences for those crimes will merge, the lesser into the greater (Weakland).
Re-examining these cases, and in retrospect, we perceive that our analysis was flawed, although the results were correct. The flaw in the analysis is that there is no legally significant difference between the cases. Whether the criminals in these cases committed one act or many is of no import. In either event, so long as the crimes are not greater and lesser included offenses, they are liable for as many crimes as they are convicted of and may be sentenced for each such crime.
Accordingly, we reaffirm our holding in Williams and abrogate the holding in Weakland. We now hold that in all criminal cases, the same facts may support multiple convictions and separate sentences for each conviction except in cases where the offenses are greater and lesser included offenses. “The same facts” means any act or acts which the accused has performed and any intent which the accused has manifested, regardless of whether these acts and intents are part of one criminal plan, scheme, transaction or encounter, or multiple criminal plans, schemes transactions or encounters. In other words, it does not matter for purposes of merger whether one regards Weakland’s striking the customer and kidnapping him as one encounter or as two encounters, for the same facts, i.e., striking the victim with a gun, may be used to satisfy the force requirements of at least two crimes, kidnapping and aggravated assault, and the sentences for each crime will not merge because these crimes are not greater and lesser included offenses.
Our concern, as we pointed out in Weakland, is to avoid giving criminals a “volume discount” on crime. If multiple acts of criminal violence were regarded as part of one larger criminal transaction or encounter which is punishable only as one crime, then there would be no legally recognized difference between a criminal who robs someone at gunpoint and a criminal who robs the person and during the same transaction or encounter pistol whips him in order to effect the robbery. *580But in Pennsylvania, there is a legally recognized difference between these two crimes. The criminal in the latter case may be convicted of more than one crime and sentences for each conviction may be imposed where the crimes are not greater and lesser included offenses.
In the case at bar, Anderson committed only one criminal act. He shot Ms. DeBooth and critically injured her by his commission of that single act. The question which arises on our reformulation of the rule is whether Anderson’s single criminal act will support convictions and sentences for more than one crime. In order to answer this question, we must consider whether the crimes of attempted murder and aggravated assault are greater and .lesser included offenses.
Aggravated assault is defined as either attempting to cause or causing “serious bodily injury to another ... intentionally, knowingly or recklessly under circumstances manifesting extreme indifference to the value of human life.” 18 Pa.C.S. § 2702(a)(1). Criminal attempt to murder is defined by reading the attempt statute, 18 Pa.C.S. § 901(a), in conjunction with the murder statute, 18 Pa.C.S. § 2502(a). Thus, attempted murder is defined as taking a substantial step towards an intentional killing. We are comparing an inchoate crime (attempted murder) with a choate crime (aggravated assault).
The operative inquiry here is whether the crimes involved are greater and lesser included offenses, i.e., whether the elements of the lesser included offense are a necessary sub-component but not a sufficient component of elements of another crime, Commonwealth v. Williams, 521 Pa. at 561 n. 2, 559 A.2d at 28 n. 2.
This inquiry, ultimately, is identical to the inquiry as to whether the double jeopardy protection of the Fifth Amendment has been violated. Prior to Weakland, and Williams, the merger analysis was “broader and more flexible” than the double jeopardy test in that it included a consideration as to whether a particular criminal act offended more than one interest of the state and whether “on the facts of the case, the two crimes were so intimately bound up in the same wrongful *581act that as a practical matter proof of one crime necessarily proves the other, so that they must be treated as the same offense.” Commonwealth v. Williams, 344 Pa.Super. 108, 124-25, 496 A.2d 31, 40 (1985). Thus, a merger analysis was different from a double jeopardy analysis, for it required a consideration of facts and the state’s interests which was not part of the double jeopardy analysis. Since Weakland and Williams, however, there is no difference between a double jeopardy analysis and a merger analysis: double jeopardy and merger are identical and the operative consideration in both is whether the elements of the offenses are the same or different.
In Commonwealth v. Tarver, this court described the analysis to be used in a double jeopardy context for determining whether two charges constitute “the same offense”:
The following test for determining when two charges constitute the “same offense” was first articulated by the U.S. Supreme Court in Blockburger v. U.S., 284 U.S. 299, 304, 52 S.Ct. 180, 182, 76 L.Ed. 306 (1932):
The applicable rule is that where the same act or transaction constitutes a violation of two distinct statutory provisions, the test to be applied to determine whether there are two offenses or only one is whether each provision requires proof of a fact which the other does not.
493 Pa. 320, 325, 426 A.2d 569, 572 (1981).2
The Court of Appeals of Maryland has stated the same test a bit differently:
[T]he usual rule for deciding whether one criminal offense merges into another or whether one is a lesser included *582offense of the other, as well as the usual rule for determining whether two offenses are deemed the same for double jeopardy purposes, when both offenses are based on the same act or acts, is the so-called “required evidence test.” ... “The required evidence is that which is minimally necessary to secure a conviction for each ... offense. If each offense requires proof of a fact which the other does not, the offenses are not the same for double jeopardy [and merger] purposes, even though arising from the same conduct or episode. But, where only one offense requires proof of an additional fact, so that all elements of one offense are present in the other, the offenses are deemed to be the same for double jeopardy [and merger] purposes.”
Williams v. State, 323 Md. 312, 593 A.2d 671, citing Thomas v. State, 277 Md. 257, 267, 353 A.2d 240, 246-47 (1976). (Citations omitted, brackets in original.)
Our inquiry, under either description of merger, is whether the elements of the lesser crime are all included within the elements of the greater crime, and the greater offense includes at least one additional element which is different, in which case the sentences merge, or whether both crimes require proof of at least one element which the other does not, in which case the sentences do not merge.3’4
In comparing the elements of the two offenses, we consider the following. The elements of attempted murder, 18 Pa.C.S. §§ 901(a), 2502(a), are:
a. Act: substantial step towards an intentional killing;
b. Intent: specific intent to kill.
*583The elements of aggravated assault, 18 Pa.C.S. § 2702(a)(1), are:
a. Act: infliction of serious bodily injury;
b. Intent: intentional; knowing; or reckless under circumstances manifesting extreme indifference to the value of human life.
It is clear that the offense of aggravated assault is necessarily included within the offense of attempted murder; every element of aggravated assault is subsumed in the elements of attempted murder. The act necessary to establish the offense of attempted murder — a substantial step towards an intentional killing — includes, indeed, coincides with, the same act which was necessary to establish the offense of aggravated assault, namely, the infliction of serious bodily injury. Likewise, the intent necessary to establish the offense of attempted murder — specific intent to kill — is greater than and necessarily includes the intentional, knowing, or reckless infliction of serious bodily injury, the intent required for aggravated assault. It is tautologous that one cannot kill without inflicting serious bodily injury. 18 Pa.C.S. § 2301. Inasmuch as aggravated assault, the lesser offense, contains some, but not all the elements of the greater offense, attempted murder, the two offenses merge for purposes of sentencing. The sentence for aggravated assault must therefore be vacated.
The order of the Superior Court is reversed and the judgment of sentence for the offense of aggravated assault is vacated. The case is remanded to the trial court for resentencing.
CASTILLE, J., files a concurring opinion. PAPADAKOS, J., concurs in the result. MONTEMURO, J., is sitting by designation.. The crimes at issue in this appeal are as follows: Aggravated Assault. 18 Pa.C.S. § 2702.
(a) Offense defined. — A person is guilty of aggravated assault if he: (1) attempts to cause serious bodily injury to another, or causes such injury intentionally, knowingly or recklessly under circumstances manifesting extreme indifference to the value of human life.
Criminal Attempt. 18 Pa.C.S. § 901.
Definition of Attempt. — A person commits an attempt when, with the intent to commit a specific crime, he does any act which constitutes a substantial step toward the commission of that crime.
Murder. 18 Pa.C.S. § 2502.
(a) Murder of the first degree. — A criminal homicide constitutes murder of the first degree when it is committed by an intentional killing.
(d) Definitions.—
“Intentional killing." Killing by means of poison, or by lying in wait or by any other kind of willful, deliberate and premeditated killing.
. Superior Court aptly summarized the Blockburger test as follows:
The Blockburger “same offense” test is the same one that traditionally has been used to determine whether one offense is a “constituent” or “lesser included” offense of another.... The test depends solely on a comparison of the elements of the crimes charged, not on the similarity or even the identity of the evidence introduced at trial to establish their commission____ Only when all the elements of one crime are also elements of the other may they be classified as the “same offense.”
Commonwealth v. Williams, 344 Pa.Super. at 116-17, 496 A.2d at 36.
. Because any merger analysis must proceed on the basis of its facts, some aspects of the statutes will be relevant and others will not. In the case at bar, an actual injury was suffered, and so we are concerned with that subsection of the aggravated assault statute which concerns actual injury. We are not concerned with that subsection of the aggravated assault statute concerning attempted injury.
. We recognize that merger may concern either sentences or offenses and that the Maryland case, Williams v. State, concerns the merger of offenses whereas Pennsylvania law concerns the merger of sentences. That difference notwithstanding, the analysis of merger in Williams and in our cases is the same.