Based on the work of Eyring and others relating to the creep problem, a velocity-modified temperature is developed for representing by means of a single variable the combined effects of strain rate and temperature on the stress reaction in a tension specimen. Available data are analyzed, indicating that the velocity-modified temperature is equally applicable to the tension test conducted at both slow and rapid rates and to the creep test. The data also indicate that the stress reaction, corresponding to tests at very slow and very rapid rates of deformation, may be found from tension tests at moderate strain rates and appropriately raised or lowered temperatures.