"...it is important that you have at least a broad understanding of what is called criminal responsibility, sometimes called complicity. Some of the names that are used are variable in different circumstances. I will try and keep it relatively simple but it is important that you know the basics. As to the two areas, there can be an overlap. One area is where we use the words "aid and abet" and the other area is "acting in concert". Can I make some general propositions, and I will make four points. An individual is normally held legally responsible for the acts that he or she perpetrates or performs or commits -many words like "perpetrate" or "perform" or "commit" are interchangeable but I will try and use the word "perpetrate". The first point should not be difficult to understand. An individual who is the perpetrator of an act that is criminal is normally responsible for that act. The perpetrator is also at times referred to as the principal, the principal being the head person. When I speak of the perpetrators where a weapon or weapons are used to cause death, I refer to the person who wields the weapon [Emphasis added]. Point 2 is that an individual, indeed more than one individual, who is not the perpetrator of a criminal act can also be held legally responsible for that act. I will generally refer to the non-perpetrator as "the secondary party". Point 3 is that it may not be clear from the evidence that there was only one perpetrator. There may be more than one act and more than one perpetrator and it may not be possible to say from the evidence who performed particular acts. Indeed, it is not unusual for a jury to be unable to come to a satisfactory conclusion on the evidence as to certain matters One is whether there was one or more that one perpetrator of the criminal acts; another is which one of more than one person present at the time of the acts was the perpetrator of the acts. Does that mean that you can go no further and find no one criminally responsible? The answer is no. An inability to come to such a conclusion on one or more of those matters does not mean that no one can be found guilty. The evidence must be sufficient to satisfy you there was responsibility in one of a number of ways: (1) responsibility as a sole perpetrator; or (2) responsibility as one of two or more perpetrators; or (3) responsibility as a secondary party who has aided or abetted the perpetrator or perpetrators, or responsibility as a secondary party who was acting in concert with a perpetrator. So it follows from that the responsibility of person as a secondary party in the commission of a crime may be established in more than one way. My point No. 4 is that the law uses, to cover that responsibility as a secondary party, different expressions for two areas that can overlap: one is where a secondary party can be seen to aid or abet, and the other is where a secondary party can be seen to have been acting in concert. But I just tell you at this stage, while I am going to give you short explanations for acting in concert and aid and abet, there is an overlap. The prosecution case put to you by [counsel for the Crown] is that the death of the deceased was caused by the use of a knife, a piece of broken bottle and a rock, or that the injuries were caused by those. You make your assessment, in the light of the evidence of Dr Dodd, as to what were the acts that caused death. [Counsel for the Crown] says there is evidence from Michelle Jackson and from other sources which could lead you of finding that when the deceased was killed there were present both accused and Michelle Jackson. If you accepted the evidence of Michelle Jackson as to the confession, both accused were perpetrators. [Counsel for the Crown] has said that you should accept that evidence, but the defence case is that you reject the evidence of Michelle Jackson because she is not a credible witness. If you did not accept the evidence of Michelle Jackson, you could not say whether only one was a perpetrator or whether both were perpetrators of the acts which caused death. You would then have to consider whether as to each accused she was either a perpetrator or responsible as a secondary party who had either aided or abetted the perpetrator or was acting in concert with the perpetrator. [Emphasis added]. I am now going to turn to acting in concert...[His Honour then directed the jury as to the concept of acting in concert in accordance with standard directions based upon the judgement of Smith J in R v Lowery and King[12], and continued]... I turn now from acting in concert to aiding and abetting. The words aid and abet are used by the law to describe a broad concept or idea of criminal responsibility. If a secondary party is linked in purpose with the perpetrator and if the secondary party, by his or her conduct, does something before or at the time of the perpetrating of the crime to bring about the commission of the crime, that secondary party is as responsible as the perpetrator. A person may be responsible as a secondary party where that person aids or abets the perpetrator or perpetrators in the commission of the crime. Proof of either one or two, aid or abet, is sufficient. It is not necessary for a jury to be unanimous on the precise basis of liability provided you agree that the liability is established as either perpetrator or secondary party on a basis not involving materially different issues or consequences. Basically, the words aid and abet are used to describe the acts of a person who is, at the time the acts are perpetrated, present and is assisting and encouraging those acts to be perpetrated, the words used to describe different aspects of the essential concept of secondary participation in a crime. A person who is liable to be a secondary party must be shown to be linked in purpose with the perpetrator by his or her words or conduct, something to bring about or more likely to bring about the perpetration of the crime. [Emphasis added]. The word aid may be more appropriate to describe physical assistance in the committing of criminal acts or to the getting to or from the scene to commit them. Abet may be the word most appropriate to describe the urging on of the perpetrator at the time. One aids and abets if one intentionally helps the perpetrator or intentionally encourages the perpetrator by words or by presence and behaviour. Ask yourselves as to each of the accused - look at the evidence in a compartmentalised way - is she a perpetrator? If not, is she liable as a secondary party? I remind you that to be liable as a secondary party, she must be either acting in concert or aiding and abetting, linked in purpose with the perpetrator, and she must, by her conduct, have done something before or at the time of the perpetrating of the crime to aid or abet the commission of the crime."