In the Drift-Control Module, the "Virtual" Load cases created and analyzed in RAM Frame are "paired" with a corresponding "real" load cases. The "pairing" of loads is an important feature of energy methods and care should be taken in identifying what virtual and real load cases to pair. For example, for studying drift-control in the global X-direction, a virtual load case applied in the X-direction should be paired with a real load case in the same direction. These load pairs could be "single" load pairs or "multiple" load-pairs. While single pairing is what is commonly used, multiple pairing may be necessary to study drifts in a certain direction. The load pairs are defined in the Load Pair dialog box in the Drift Control Module, which lists both the analyzed virtual and real load cases. Pairing is done by specifying the virtual and real components of the pair and the factor that multiplies them. The factor is usually taken as 1.0.