We negotiate every day with prospective employers, teammates, roommates, landlords, service providers, and many others. What prices we want to pay, how much we want to be paid, how assignments will be divided and credit allocated… all of these are negotiations. Yet, while we negotiate routinely, many of us know very little about the strategy and psychology of effective negotiations. Why do we sometimes get our way while other times we walk away feeling frustrated by our inability to achieve the agreement we desire?