Refers to your “best alternative to a negotiated agreement,” or the best outcome you can expect if you fail to reach agreement at the bargaining table with your counterpart. 
An evaluation of your BATNA is critical if you are to establish the threshold at which you will reject an offer. 
Effective negotiators determine their BATNAs before talks begin.

BATNA

You and your counterpart may be more collaborative and likely to reach an agreement if you spend even just a few minutes trying to get to know each other.
 If you’re negotiating over email, even a brief introductory phone call may make a difference. This is one of the most valuable negotiation skills to master.

Building rapport

Resist the common urge to think about what you’re going to say next while your counterpart is talking and listen carefully to her arguments, then paraphrase what you believe she said to check your understanding. Acknowledge any difficult feelings, like frustration, behind the message. Not only are you likely to acquire valuable information, but the other party may mimic your exemplary listening skills.

Listen actively

Ask lots of questions that are likely to get helpful answers. 
Avoid asking “yes or no” questions and leading questions, such as “Don’t you think that’s a great idea?” and craft neutral questions that encourage detailed responses, such as “Can you tell me about the challenges you’re facing this quarter?”

Ask good questions

Try to identify issues that your counterpart cares deeply about that you value less. Then propose making a concession on that issue in exchange for a concession from her on an issue you value highly.

Search for smart tradeoffs

Rather than making one offer at a time, consider presenting several offers at once. This strategy of presenting multiple offers simultaneously decreases the odds of impasse and can promote more creative solutions.If your counterpart rejects all of them, ask him to tell you which one he liked best and why. Then work on your own to improve the offer, or try to brainstorm with the other party an option that pleases you both.

Present multiple equivalent offers simultaneously

Place milestones and deadlines in your contract to ensure that commitments are being met. 
Consider agreeing to meet at regular intervals throughout the life of the contract to check in and, if necessary, renegotiate. 
In addition, adding a dispute-resolution clause that calls for the use of mediation or arbitration if a conflict arises can be a wise move.

Plan for the implementation stage

Carefully negotiate how you will negotiate in advance. Discussing procedural issues will clear the way for much more focused talks.
Don’t assume you’re all on the same page when it comes to determining when to meet, who should be present, what your agenda will be, and so on.

Negotiate the process

The first number mentioned in a negotiation, however arbitrary, exerts a powerful influence on the negotiation that follows. 
You can avoid being the next victim of the anchoring bias by making the first offer (or offers) and trying to anchor talks in your preferred direction.

Being aware of the anchoring bias

In essence, a bet about how future events will unfold.
Works best when negociations get stuck because of disagreements on how certain scenarios will play over time.
E. g.: if you doubt a contractor’s claims that he can finish your home renovation project in 3 months, propose a contingent contract that will penalize him for late completion and/or reward him for early completion.

Contingent contract

Increasingly, business negotiators recognize that the most effective bargainers are skilled at both creating value and claiming value-that is, they both collaborate and compete. The following 10 negotiation skills will help you succeed at integrative negotiation: 1. Analyze and cultivate your BATNA.