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ABA Model Rules of Professional Conduct
Comment - Rule 2.2
 A lawyer acts as intermediary under this Rule when the lawyer represents two or more parties with potentially conflicting interests. A key factor in defining the relationship is whether the parties share responsibility for the lawyer's fee, but the common representation may be inferred from other circumstances. Because confusion can arise as to the lawyer's role where each party is not separately represented, it is important that the lawyer make clear the relationship.
 The Rule does not apply to a lawyer acting as arbitrator or mediator between or among parties who are not clients of the lawyer, even where the lawyer has been appointed with the concurrence of the parties. In performing such a role the lawyer may be subject to applicable codes of ethics, such as the Code of Ethics for Arbitration in Commercial Disputes prepared by a joint Committee of the American Bar Association and the American Arbitration Association.
 A lawyer acts as intermediary in seeking to establish or adjust a relationship between clients on an amicable and mutually advantageous basis; for example, in helping to organize a business in which two or more clients are entrepreneurs, working out the financial reorganization of an enterprise in which two or more clients have an interest, arranging a property distribution in settlement of an estate or mediating a dispute between clients. The lawyer seeks to resolve potentially conflicting interests by developing the parties' mutual interests. The alternative can be that each party may have to obtain separate representation, with the possibility in some situations of incurring additional cost, complication or even litigation. Given these and other relevant factors, all the clients may prefer that the lawyer act as intermediary.
 In considering whether to act as intermediary between clients, a lawyer should be mindful that if the intermediation fails the result can be additional cost, embarrassment and recrimination. In some situations the risk of failure is so great that intermediation is plainly impossible. For example, a lawyer cannot undertake common representation of clients between whom contentious litigation is imminent or who contemplate contentious negotiations. More generally, if the relationship between the parties has already assumed definite antagonism, the possibility that the clients' interests can be adjusted by intermediation ordinarily is not very good.
 The appropriateness of intermediation can depend on its form. Forms of intermediation range from informal arbitration, where each client's case is presented by the respective client and the lawyer decides the outcome, to mediation, to common representation where the clients' interests are substantially though not entirely compatible. One form may be appropriate in circumstances where another would not. Other relevant factors are whether the lawyer subsequently will represent both parties on a continuing basis and whether the situation involves creating a relationship between the parties or terminating one.
Confidentiality and Privilege
 A particularly important factor in determining the appropriateness of intermediation is the effect on client-lawyer confidentiality and the attorney-client privilege. In a common representation, the lawyer is still required both to keep each client adequately informed and to maintain confidentiality of information relating to the representation. See Rules 1.4 and 1.6. Complying with both requirements while acting as intermediary requires a delicate balance. If the balance cannot be maintained, the common representation is improper. With regard to the attorney-client privilege, the prevailing rule is that as between commonly represented clients the privilege does not attach. Hence, it must be assumed that if litigation eventuates between the clients, the privilege will not protect any such communications, and the clients should be so advised.
 Since the lawyer is required to be impartial between commonly represented clients, intermediation is improper when that impartiality cannot be maintained. For example, a lawyer who has represented one of the clients for a long period and in a variety of matters might have difficulty being impartial between that client and one to whom the lawyer has only recently been introduced.
 In acting as intermediary between clients, the lawyer is required to consult with the clients on the implications of doing so, and proceed only upon consent based on such a consultation. The consultation should make clear that the lawyer's role is not that of partisanship normally expected in other circumstances.
 Paragraph (b) is an application of the principle expressed in Rule 1.4. Where the lawyer is intermediary, the clients ordinarily must assume greater responsibility for decisions than when each client is independently represented.
 Common representation does not diminish the rights of each client in the client-lawyer relationship. Each has the right to loyal and diligent representation, the right to discharge the lawyer as stated in Rule 1.16, and the protection of Rule 1.9 concerning obligations to a former client.
Model Code Comparison
There was no direct counterpart to this Rule in the Disciplinary Rules of the Model Code. EC 5-20 stated that a "lawyer is often asked to serve as an impartial arbitrator or mediator in matters which involve present or former clients. He may serve in either capacity if he first discloses such present or former relationships." DR 5-105(B) provided that a lawyer "shall not continue multiple employment if the exercise of his independent judgment in behalf of a client will be or is likely to be adversely affected by his representation of another client, or if it would be likely to involve him in representation of differing interests, except to the extent permitted under DR 5-105(C)." DR 5-105(C) provided that "a lawyer may represent multiple clients if it is obvious that he can adequately represent the interests of each and if each consents to the representation after full disclosure of the possible effect of such representation on the exercise of his independent professional judgment on behalf of each."