Massachusetts Rules of Professional Conduct: Scope
 The Rules of Professional Conduct are rules of reason. They should be interpreted with reference to the purposes of legal representation and of the law itself. Some of the Rules are imperatives, cast in the terms "shall" or "shall not." These define proper conduct for purposes of professional discipline. Others, generally cast in the term "may" are permissive and define areas under the Rules in which the lawyer has professional discretion. No disciplinary action should be taken when the lawyer chooses not to act or acts within the bounds of such discretion. Other Rules define the nature of relationships between the lawyer and others. The Rules are thus partly obligatory and disciplinary and partly constitutive and descriptive in that they define a lawyer's professional role. Many of the Comments use the term "should." Comments do not add obligations to the Rules but provide guidance for practicing in compliance with the Rules.
 The Rules presuppose a larger legal context shaping the lawyer's role. That context includes court rules and statutes relating to matters of licensure, laws defining specific obligations of lawyers, and substantive and procedural law in general. Compliance with the Rules, as with all law in an open society, depends primarily on understanding and voluntary compliance, secondarily on reinforcement by peer and public opinion, and, finally, when necessary, on enforcement through disciplinary proceedings. The Rules do not, however, exhaust the moral and ethical considerations that should inform a lawyer, for no worthwhile human activity can be completely defined by legal rules. The Rules simply provide a framework for the ethical practice of law.
 Furthermore, for purposes of determining the lawyer's authority and responsibility, principles of substantive law external to these Rules determine whether a client-lawyer relationship exists. Most of the duties flowing from the client-lawyer relationship attach only after the client has requested the lawyer to render legal services and the lawyer has agreed to do so. But there are some duties, such as that of confidentiality under Rule 1.6, that may attach when the lawyer agrees to consider whether a client-lawyer relationship shall be established. Whether a client-lawyer relationship exists for any specific purpose can depend on the circumstances and may be a question of fact.
 Under various legal provisions, including constitutional, statutory, and common law, the responsibilities of government lawyers may include authority concerning legal matters that ordinarily reposes in the client in private client-lawyer relationships. For example, a lawyer for a government agency may have authority on behalf of the government to decide upon settlement or whether to appeal from an adverse judgment. Such authority in various respects is generally vested in the Attorney General, and Federal counterparts, and the same may be true of other government law officers. Also, lawyers under the supervision of these officers may be authorized to represent several government agencies in intragovernmental legal controversies in circumstances where a private lawyer could not represent multiple private clients. They also may have authority to represent the "public interest" in circumstances where a private lawyer would not be authorized to do so. These rules are not meant to address the substantive statutory and constitutional authority of the Attorney General when appearing for the Commonwealth to assume primary control over the litigation and to decide matters of legal policy on behalf of the Commonwealth.
 Failure to comply with an obligation or prohibition imposed by a Rule is a basis for invoking the disciplinary process. The Rules presuppose that disciplinary assessment of a lawyer's conduct will be made on the basis of the facts and circumstances as they existed at the time of the conduct in question and in recognition of the fact that a lawyer often has to act on uncertain or incomplete evidence of the situation. Moreover, the Rules presuppose that whether or not discipline should be imposed for a violation, and the severity of a sanction, depend on all the circumstances, including the wilfulness and seriousness of the violation, extenuating factors, and whether there have been previous violations.
 "A violation of a canon of ethics or a disciplinary rule . . . is not itself an actionable breach of duty to a client." Fishman v. Brooks, 396 Mass. 643, 649 (1986). The Rules are designed to provide guidance to lawyers and to provide a structure for regulating conduct through disciplinary agencies. The fact that a Rule is just a basis for a lawyer's self-assessment, or for sanctioning a lawyer under the administration of a disciplinary authority, does not necessarily mean that an antagonist in a collateral proceeding or transaction may rely on a violation of a Rule. "As with statutes and regulations, however, if a plaintiff can demonstrate that a disciplinary rule was intended to protect one in his position, a violation of that rule may be some evidence of the attorney's negligence." Id. at 649.
 Moreover, these Rules are not intended to govern or affect judicial application of either the attorney-client or work product privilege. Those privileges were developed to promote compliance with law and fairness in litigation. In reliance on the attorney-client privilege, clients are entitled to expect that communications within the scope of the privilege will be protected against compelled disclosure. The attorney-client privilege is that of the client and not of the lawyer. The fact that in exceptional situations the lawyer under the Rules has a limited discretion to disclose a client confidence does not vitiate the proposition that, as a general matter, the client has a reasonable expectation that information relating to the client will not be voluntarily disclosed and that disclosure of such information may be judicially compelled only in accordance with recognized exceptions to the attorney-client and work product privileges.
 The Comment accompanying each Rule explains and illustrates the meaning and purpose of the Rule. The Preamble and this note on Scope provide general orientation. The Comments are intended as guides to interpretation, but the text of each Rule is authoritative.
Adopted June 9, 1997, effective January 1, 1998.