Glass selection tends to be both a science and an art. It is the intent of this paper to remove the "mystique" surrounding glass selection, primarily based on the chromatic properties of the glass, and to show via careful parametric analyses how we can optimally select glasses for lenses of different f/numbers, spectral bands, and performance requirements. The important roles of refractive index and Abbe number as well as partial dispersion will be considered. Using the SCHOTT glass map, six separate and identifiable regions along with glasses within each region will be discussed. The goal for this paper is to make glass selection easier to understand.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.