This document discusses 4 psychological principles for building strong business relationships: 1) employing the endowment effect by making others feel like part of the company, 2) leveraging the rule of reciprocity by helping others first to build cooperation, 3) encouraging investment by making contributing easy so people continue connecting, and 4) overcoming risk aversion through transparency, frequent touchpoints, and trustworthiness. It recommends the collaboration software Cureo, which allows sharing processes securely to bring remote stakeholders together.