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In this Blog we will discuss confidentiality in mediation, both from a statutory perspective and the common law.

Legislative Framework

Commercial mediations in Ontario are governed by the Commercial Mediation Act, 2010 (“CMA”), which states: “[i]nformation relating to the mediation must be kept confidential by the parties, the mediator and any other persons involved in the conduct of the mediation”.[1]

The CMA sets out five exceptions to the duty to keep information relating to a mediation confidential:

  1. all the parties and the mediator agree to the disclosure;
  2. the disclosure is required by law;
  3. the disclosure is required for the purposes of carrying out or enforcing a settlement agreement;
  4. the disclosure is required for a mediator to respond to a claim of misconduct; or
  5. the disclosure is required to protect the health or safety of any person.[2]

Settlement Privilege

In addition to this statutory requirement, there exists the common law evidentiary rule of settlement privilege, which applies to settlement negotiations regardless of whether the parties have expressly invoked it.[3]

Confidentiality Clauses

It is common practice for parties in a mediation (whether commercial or otherwise) to include confidentiality clauses in their signed mediation agreements, which provide for, among other things, the confidentiality of communications made in the course of the mediation.

Union Carbide Canada Inc. v. Bombardier Inc.

The issue of confidentiality in mediation commonly arises where parties have reached a settlement and subsequently disagree about the scope of the settlement; the parties then seek to reference mediation discussions in litigation with a view to proving the scope of the settlement. The Supreme Court of Canada considered confidentiality in this context in Union Carbide Canada Inc. v. Bombardier Inc. (“Union Carbide”),[4] concluding that, “[i]t is open to contracting parties to create their own rules with respect to confidentiality that entirely displace the common law of settlement privilege.”[5]

In Union Carbide, however, the settlement privilege rule applied, as the parties failed to indicate that they wished to preclude the admissibility of the negotiations in later proceedings to enforce the settlement agreement.


Lessons from Union Carbide

Parties entering a mediation agreement who wish to maintain the confidentiality of their negotiations can learn two lessons from Union Carbide:

  1. contract for certainty by including a confidentiality clause in your mediation agreement which clearly states that negotiations are not to be admitted in subsequent proceedings; and
  2. reduce the terms of settlement into writing immediately to avoid future ambiguity.


Next Blog series:

The next blog in this series will look at negotiation.

[1] Commercial Mediation Act, 2010, S.O. 2010, c. 16, Sched. 3, s. 8(1).
[2] Ibid., s. 8(2).
[3] Union Carbide Canada Inc. v. Bombardier Inc., 2014 SCC 35 at para. 1.
[4] Ibid.
[5] Ibid. at para. 51.

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