The DSA is a voluntary, nonprofit educational corporation, organized for the conduct of research and education of the public in the use of dozenal (also called duodecimal or base twelve) in calculations, mathematics, weights and measures, and other branches of pure and applied science.

The Duodecimal Bulletin examines all dozenal numeral proposals known at the time in this two-part editorial. Part I looks into “Least Change” proposals (as classified by R. Beard.) This is Part I; see alsoA Numeral Toolbox for Part II.