For strict price negotiations, Voss recommends the Ackerman Model. This is a structured, six-step process for offering and countering: (your goal). Make your initial offer at 65% of your target price.
One of the most practical applications of Voss's work is negotiating a higher salary. Here is a step-by-step approach based on the book: never split the difference by chris voss pdf
In his seminal book, Never Split the Difference: Negotiating As If Your Life Depended On It , former FBI lead international hostage negotiator Chris Voss For strict price negotiations, Voss recommends the Ackerman