The evolution of normal galaxies is predominantly driven by stars. Young, massive stars with masses above ~ 5 M forming in starbursts provide the thermal and non-thermal luminosity responsible for the observed global galactic parameters (Heckman 1998). The tight connection of stellar and galactic properties permits the use of stars as tracers of starbursts as a whole. Therefore, understanding and reading the clock set by stellar evolution is a necessary prerequisite for age-dating starbursts. It is not a sufficient condition, however, as the complex morphology of stars, gas, and dust in a starburst make it difficult to interpret such an idealized clock.