Note on Best Alternative to a Negotiated Agreement via wikipedia.org
the best alternative to a negotiated agreement or BATNA (no deal option) refers to the most advantageous alternative course of action a party can take if negotiations fail and an agreement cannot be reached
BATNA is the key focus and the driving force behind a successful negotiator. A party should generally not accept a worse resolution than its BATNA.
BATNA of the other party determines their negotiating power.