Your BATNA "is the only standard which can protect you both from accepting terms that are too unfavorable and from rejecting terms it would be in your interest to accept."[2] In the simplest terms, if the proposed agreement is better than your BATNA, then you should accept it. If the agreement is not better than your BATNA, then you should reopen negotiations. If you cannot improve the agreement, then you should at least consider withdrawing from the negotiations and pursuing your alternative (though the relational costs of doing that must be considered as well).