This document discusses three thermodynamic variables that affect the efficiency and work output of a Rankine cycle: (1) superheating of steam, (2) boiler pressure, and (3) exhaust steam pressure. Superheating steam increases efficiency by raising the average heat addition temperature while keeping the average heat rejection temperature the same. Increasing boiler pressure raises net work and lowers heat rejected, improving efficiency. Reducing condenser pressure raises net work and efficiency by lowering the average heat rejection temperature.