# Open system (systems theory)
## MicroSim spec
- **Recommended sim type:** [[Feedback|feedback]]-loop diagram
- **Microsimmability score:** 69/100
- **Layout:** feedback [[Block_diagram|block diagram]] with an arrowed loop on the canvas; sliders below.
### Parameters (tunable controls)
- `Loop gain`
- `Setpoint`
- `Delay`
### What animates
A [[Signal|signal]] circulates through the loop while the gain, setpoint, and delay reshape how the output converges, oscillates, or runs away.
### Learning objective
Relate loop gain and delay to whether the system stabilizes or destabilizes.
## Links (Wikipedia order)
<!-- injected from _registry/childlinks/Open_system_(systems_theory).json (2026-07-30T02:09:12Z) -->
`1997_Asian_financial_crisis` · `Accumulation_by_dispossession` · [[Black_box]] · [[Business_process]] · `Capitalism` · [[Closed_system]] · [[Complex_system]] · [[Control_theory]] · [[Dynamical_system]] · [[Energy]] · `Foreign_direct_investment` · [[Glossary_of_systems_theory]] · [[Information_theory]] · [[Isolated_system]] · `Kostas_Axelos` · `Louis_Althusser` · [[Ludwig_von_Bertalanffy]] · `Mass` · `Maximum_power_principle` · [[Niklas_Luhmann]] · `Non-equilibrium_thermodynamics` · `Open_system_(computing)` · `Openness` · `Organismic_theory` · `Overdetermination` · `Praxis_intervention` · [[Principia_Cybernetica]] · `Privatization` · `Radiant_energy` · `Religion` · [[Signal_processing]] · `Sociology_of_religion` · `Structural_functionalism` · [[System]] · [[Systems_engineering]] · [[Systems_theory]] · [[Talcott_Parsons]] · [[Thermodynamic_system]] · [[Thermodynamics]] · [[Wayback_Machine]] · `World-systems_theory`
> p5.js MicroSim stub · part of [[System]] · [Wikipedia source](https://en.wikipedia.org/wiki/Open_system_%28systems_theory%29)
> Relation: subfield of System.
## Concept summary
An open system is a system that has external interactions.
## Build checklist
- [ ] Claim it: set `status: in-progress` + `lease` + `leased_at`
- [ ] Write the child page explaining the concept (tie it back to system)
- [ ] 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: Open system (systems theory)
let controls = {};
function setup() {
// createCanvas(...); create sliders for the parameters above.
}
function draw() {
// background(...); read controls; render feedback-loop diagram; respond live.
}
```
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Back to [[System]] · Wikipedia: [Open system (systems theory)](https://en.wikipedia.org/wiki/Open_system_%28systems_theory%29)
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<!-- 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 (4):** 🟡 system (14) · 🟢 feedback (5) · 🟢 signal (2) · 🟢 oscillation (1)
**Enter by sign:** Systems Semiotic Gateway · Alphabetum · Icon Registry · ← Systems Portal
<!-- SEMIOTIC-PROFILE:END -->
## Wikipedia : Wikitube
**Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Open_system_%28systems_theory%29) : [Wikitube](https://en.wikitube.io/wiki/Open_system_%28systems_theory%29)
## Previous hub tags
Tree parents: [[Complex_system]] · [[Systems_science]] · [[Systems_theory]].
Legacy hubs: none.
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*Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*