2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/156822Excel lacks features for modular design. Had it such features, as do most programming languages, they would save time, avoid unneeded programming, make mistakes less likely, make code-control easier, help organisations adopt a uniform house style, and open business opportunities in buying and selling spreadsheet modules. I present Excelsior, a system for bringing these benefits to Excel.13 Pages, Code FragmentsSoftware EngineeringD.1.7; D.2.1; D.2.11; D.3.2; D.3.3; H.4.1; K.6.4; K.8.1text