A fourth-generation language (4GL) is a high-level language—or a broader software environment—that lets people express database, reporting, or application tasks with less implementation detail than a third-generation language (3GL). The term has no single modern feature checklist: some definitions describe the language’s abstraction, while others include the integrated tools around it.
What does 4GL mean?
TERMIUM Plus, the Government of Canada’s terminology database, gives a definition associated with ISO/IEC 2382-7:2000. It describes a 4GL as a high-level language in which users, who need not be programmers, can write statements in near-natural language and work at a higher level of abstraction than with earlier generations of programming languages. The record dates from 2004-08-06: TERMIUM Plus: “4TH GENERATION LANGUAGE”.
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In practical terms, the language or environment handles more of the mechanics. A developer states the desired task or result, and the system supplies some of the steps that would otherwise need to be written explicitly. “Near-natural language” does not mean that every 4GL is ordinary English; it describes a relative increase in readability and abstraction, not a shared syntax.
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Some descriptions use 4GL for a language; others use it for an integrated set of tools for building interactive business applications. A government-hosted functional model presents the broader view: an environment may combine a query language, screen formatter, report formatter, procedural language, data dictionary, and database-management system or file handler. Those are representative components, not requirements that every product labeled 4GL must include.
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The language-centered and environment-centered definitions are compatible. One focuses on how much detail the language requires; the other describes the surrounding facilities that make common business-development tasks possible. The exact scope depends on the source and product, so the label alone does not tell you which functions are included. See the government-hosted report excerpt on 4GLs and “A functional model for fourth generation languages”.
How is a 4GL different from a 3GL?
The useful distinction is the amount and kind of implementation detail a programmer must specify—not a strict measure of language age or a claim that one generation is always better.
- With a 4GL approach, the developer describes a task or desired result in a more goal-oriented way. Common database, form, or report operations may be handled by the language or its tools.
- With a more procedural approach, the developer spells out more of the operations needed to produce that result.
Actian’s Ingres 12.0 documentation, for example, describes its own 4GL as letting developers specify what should be done rather than how to implement every step, and as supporting forms-based applications with relatively little programming. That is a product-specific description, not a universal promise about every 4GL: Ingres 12.0 documentation: “Overview of 4GL”.
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What are examples of 4GLs?
Examples depend on the taxonomy being used. TERMIUM Plus names dBASE in a context note, while the archival 4GL Alliance project history includes SQL and other examples in a broad historical discussion. These references illustrate varied usage; they do not establish that every source classifies each example as a 4GL in every context.
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There is no single exhaustive, universally accepted list established by these sources. When evaluating a named language or product, look at what it actually does and how its documentation uses the term, rather than assuming all 4GLs share the same syntax or tools. The archival discussion is available in the 4GL Alliance Developer Guide project history.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess a language described as 4GL
The label is broad, so compare concrete capabilities instead of relying on the generation number alone:
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- Task and domain: Does it target database queries, reporting, forms-based applications, or another kind of work?
- Abstraction: Does it express outcomes declaratively, use procedural steps, or combine both?
- Included tools: Does the product include query, reporting, screen-formatting, data-dictionary, or database facilities?
- Platform and compatibility: Which systems and data sources does that particular product support? The term 4GL does not establish compatibility.
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