# Extensibility
## MicroSim spec
- **Recommended sim type:** plug-in / growth
- **Microsimmability score:** 80/100
- **Layout:** drawing region (canvas) on top; control region (sliders/buttons) below.
### Parameters (tunable controls)
- `Extension points`
- `Core stability`
- `Feature load`
### What animates
New features plug into extension points; integration cost stays flat or explodes as core stability and hook design change.
### Learning objective
Relate the cost of new features to extension-point design.
## Links (Wikipedia order)
<!-- injected from _registry/childlinks/Extensibility.json (2026-07-30T02:09:12Z) -->
`Applet` · [[Black_box]] · `Code_refactoring` · `Cohesion_(computer_science)` · `Common_Gateway_Interface` · `Coupling_(computer_programming)` · `Dataflow` · `Device_driver` · `Extensible_programming` · `Interface_(computing)` · `Loadable_kernel_module` · `Plug-in_(computing)` · `Polymorphism_(computer_science)` · [[Scalability]] · [[Software_architecture]] · `Software_development_process` · [[Software_engineering]] · `Software_framework` · `Software_metric` · `Source_code` · [[System]] · `Systems_design` · [[Wayback_Machine]] · `XML`
## From the Real GENERATIVE library
*Extensibility — placed from the Real G.E.N.E.R.A.T.I.V.E. course library (Engineering room). Source: Wikimedia Commons (via Wikipedia article media). [Details & license](https://commons.wikimedia.org/wiki/File:Ambox_question.svg).*
> Extensibility is a software engineering and systems design principle that provides for future growth. Extensibility is a measure of the ability to extend a system and the level of effort required to implement the extension. ([Wikipedia](https://en.wikipedia.org/wiki/Extensibility))
<!-- REAL-GENERATIVE-MEDIA:END -->
> p5.js MicroSim stub · part of System Quality Attributes · [Wikipedia source](https://en.wikipedia.org/wiki/Extensibility)
> Relation: subfield of system quality attributes.
## Concept summary
Extensibility is the ease of adding new capabilities to a [[System|system]] without disturbing its existing [[Structure|structure]].
## Build checklist
- [ ] Claim it: set `status: in-progress` + `lease` + `leased_at`
- [ ] Write the child page explaining the concept (tie it back to system quality attributes)
- [ ] Finalize parameter ranges and defaults
- [ ] Implement the p5.js sketch (drawing + control regions)
- [ ] Add caption + the learning objective on the page
- [ ] Set `status: done`
## p5.js sketch
```javascript
// MicroSim: Extensibility
let controls = {};
function setup() {
// createCanvas(...); create sliders for the parameters above.
}
function draw() {
// background(...); read controls; render plug-in / growth; respond live.
}
```
---
Back to System Quality Attributes · Wikipedia: [Extensibility](https://en.wikipedia.org/wiki/Extensibility)
---
<!-- SEMIOTIC-PROFILE:START -->
## Semiotic profile
> *The semiotic universals this article invokes, machine-derived from the crossref — **unverified** (born so). Populated 2026-07-06 for the Systems room.*
**Universals (3):** 🟡 system (7) · 🟡 structure (2) · 🟢 stability (2)
**Enter by sign:** Systems Semiotic Gateway · Alphabetum · Icon Registry · ← Systems Portal
<!-- SEMIOTIC-PROFILE:END -->
<!-- REAL-GENERATIVE-MEDIA:START -->
## Wikipedia : Wikitube
**Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Extensibility) : [Wikitube](https://en.wikitube.io/wiki/Extensibility)
## Previous hub tags
Tree parent: [[Systems_engineering]].
Legacy hubs: none.
---
*Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*