At Gray Institute®, a process serves as the foundation of Applied Functional Science® (AFS). Specifically, this is called the Principles-Strategies-Techniques (PST) Process. The Techniques (movements / exercises) that are used for examination and treatment are derived from a specific Strategy. The Strategies emanate from one or more Principles (or truths) of human movement. This blog will describe how the Techniques are designed based on a Strategy that emanates from the Principle that human movement is three-dimensional (3D).