Work requires an enabling force. In physical systems, energy may appear as heat, gravity, or motion. In social systems, energy often takes the form of motivation, fear, loyalty, profit-seeking, ideology, honor, desire, or belief. STF does not seek to identify a single motive behind every action; rather, it seeks to identify the energy configuration that enables a system to perform work consistently over time. Understanding energy is essential because systems cannot operate, expand, or persist without a source of enablement.