General-purpose modelling (GPM) is the systematic use of a general-purpose modelling language to represent the various facets of an object or a system. Examples of GPM languages are: * The Unified Modelling Language (UML), an industry standard for modelling software-intensive systems * EXPRESS (ISO 10303-11), an international standard for the specification of data models * IDEF, a group of languages from the 1970s that aimed to be neutral, generic and reusable * Gellish, an industry standard natural language oriented modeling language for storage and exchange of data and knowledge, published in 2005 * Lisp, a functional programming language designed for symbol processing, later extended with imperative abilities * XML, a data modelling language now beginning to be used to model