BATNA (Best Alternative to a Negotiated Agreement)

BATNA — Best Alternative to a Negotiated Agreement — is one of the most practically useful concepts in negotiation and mediation. Coined by Roger Fisher and William Ury in their landmark work on principled negotiation, it answers a simple but often-neglected question: what happens to me if this negotiation fails?

Why BATNA matters

Without a clear BATNA, parties often make two errors:

Overvaluing the negotiation. A party without a realistic alternative may accept a poor settlement simply because they have not acknowledged how bad their walk-away option actually is. Conversely, they may reject a reasonable offer because they have not honestly assessed whether their BATNA is as good as they believe.

Undervaluing the negotiation. A party who believes their BATNA is strong may hold out for terms the other side cannot give, missing a settlement that would actually serve them better than their real alternative once they account for cost, time, and uncertainty.

Determining your BATNA

Your BATNA for a commercial dispute is typically litigation or arbitration. Assess it honestly — which means accounting for:

• The probability you will win (not the best case, the realistic case)
• The time the proceeding will take and the impact during that time
• The cost of legal proceedings on your side
• The likelihood of collecting if you win
• What the uncertainty itself costs you in management focus and relationship damage

Most parties who have done this exercise honestly find that a mediated settlement producing 60–80% of what they claim is frequently better than their realistic BATNA — not because they are wrong on the law or facts, but because their BATNA's real value is lower than their nominal claim once cost and uncertainty are factored in.

BATNA in mediation

A good mediator will often help parties reality-test their BATNA through questions — not to pressurise them into accepting a settlement, but to ensure they are evaluating any proposed agreement against a realistic alternative rather than an optimistic one. In caucus, a mediator might ask: if mediation fails today, what is your most likely outcome and when?

BATNA vs WATNA

WATNA — Worst Alternative to a Negotiated Agreement — is the complement to BATNA. Knowing both the best and worst realistic alternatives brackets the range within which a negotiated settlement makes sense. Most experienced negotiators keep both in mind: aim to beat your BATNA while avoiding your WATNA.

See how to prepare for mediation for how to work this out before a session.