Price-volume formulas for variance analysis. In doing performance variance analysis, it is often necessary to determine how much of the overall variance came from a change in volume and how much from price. An example of this is in purchasing spend where the volume differs from year to year (generally growing), and the price is going down.
Inside These Walls. While there are countless grand churches in Europe, including Westminster Abbey in London and St. Peterâs Basilica in Rome, only those that serve as the seat of a bishop can technically be called cathedrals.
Justinian's monuments in Istanbul include the domed churches of Hagia Sophia and Hagia Irene, but there is also an earlier, smaller church of Saints Sergius and Bacchus (locally referred to as Little Hagia Sophia), which might have served as a model for both in that it combined the elements of a longitudinal basilica with those of a centralized building.