This guide aims to be an often-used reference that will be found on the desk of any STEM professional or student across fields, industries, and levels. With each part, we add a new layer of complexity to working with others. We start with part 1, “The First Principle Is You,” and end with part 5, “The First Principles of Leading Teams of Teams.” Each topic in each part follows a consistent structure, so you know what to expect when you flip through and find a problem you’re trying to solve or a capability you’re trying to improve upon.