In this lesson, you and your partner will learn how to create appropriate boundaries that are designed to help you manage external relationships. The first portion of the lesson will help you establish a working definition for boundaries and what both partners need to protect the relationship from external forces. Next, you will be introduced to tools designed to assist you both with sustaining boundaries that are designed to ward off intruders. Lastly, this lesson will conclude with a few examples and case studies that illustrate how to defend your relationship from the most common types of boundary intruders.