WORK
COBOL
The Common Business-Oriented Language — Hopper's 1959 programming language designed so that business professionals could read and verify what their programs actually did — whose English-like syntax (ADD PRICE TO TOTAL) shifted programming from a mathematician's craft to a business-literate practice.
COBOL was the first programming language designed for verification by non-programmers. Hopper served on the committee that defined it in 1959, and her advocacy shaped its distinguishing feature: instead of mathematical notation, COBOL used English-like syntax that a business manager could read and evaluate against her domain knowledge. A program that said ADD PRICE TO TOTAL was not self-explanatory to a chef, but it was self-explanatory to an accountant — and the accountant was the person whose needs the program existed to serve. The design choice embodied Hopper's framework: if the relevant competence is evaluation rather than comprehension, the language should be built for evaluators. COBOL dominated business computing for three decades and remains, as of 2025, the substrate for approximately 80 percent of in-person business transactions globally. Its significance for the Hopper volume is not technical but structural: it demonstrated that widening the door was not a theoretical aspiration but an implementable design principle, and that