{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.stability","code":"thing-q2325497","url":"https://ver.cy/models/thing/q2325497/","name":"stability","alternateNames":["thermodynamic stability","family stability","sedimentation stability","functional stability","foam stability","Linear stability","permanence","stability of elastic systems","hydrodynamic stability","Plasma stability","political stability","Input-to-state stability"],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.QLT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Stability in the supplied sense is the tendency of a physical system to return to its equilibrium or steady state after disturbance; remaining nearby without returning is a distinct stability criterion, and thermodynamic stability depends on the applicable constraints and thermodynamic potential rather than universally requiring lowest energy.","purpose":"Let an agent explain the return of physical systems to equilibrium or steady states after disturbance, describe applicable stability criteria and evidence, and support learning and modelling questions.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["The property concerns a physical system's response to disturbance from an equilibrium or steady state.","Returning to the reference state is distinct from remaining nearby without returning.","Mathematical criteria depend on the physical model, constraints and disturbances considered.","Stability can be a design goal for physical systems."],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What stability is.","layers":[{"id":"concept","name":"Concept","description":"Concept and senses.","findings":[{"id":"concept-finding","name":"Concept","description":"Concept.","questions":[{"text":"What is stability in general, and how do mechanical, thermodynamic, chemical, colloidal, ecological and social senses differ?","kind":"definition"},{"text":"Which sense is meant?","kind":"boundary"}]}]},{"id":"criteria","name":"Criteria","description":"Criteria.","findings":[{"id":"criteria-finding","name":"Criteria","description":"Criteria.","questions":[{"text":"How is stability defined mathematically, including linear stability and stability of equilibria?","kind":"definition"},{"text":"Which entry fits dynamical systems?","kind":"action"}]}]}]},{"id":"analyse","name":"Analyse","description":"Analysis and measurement.","layers":[{"id":"analyse","name":"Analyse","description":"Analysing a system.","findings":[{"id":"analyse-finding","name":"Analyse","description":"Analysis.","questions":[{"text":"How can the stability of this system be analysed or tested?","kind":"action"},{"text":"Which entry fits control theory or structural analysis?","kind":"action"}]}]},{"id":"measure","name":"Measure","description":"Measuring stability.","findings":[{"id":"measure-finding","name":"Measure","description":"Measurement.","questions":[{"text":"How are chemical, colloidal and foam stability measured experimentally?","kind":"measurement"},{"text":"Which standards apply?","kind":"provenance"}]}]}]},{"id":"apply","name":"Apply","description":"Applications.","layers":[{"id":"design","name":"Design","description":"Designing for stability.","findings":[{"id":"design-finding","name":"Design","description":"Design.","questions":[{"text":"How are structures, vehicles, control systems and products designed to be stable?","kind":"provenance"},{"text":"Which entry fits a specific application?","kind":"action"}]}]},{"id":"systems","name":"Systems","description":"Ecological and social systems.","findings":[{"id":"systems-finding","name":"Systems","description":"Systems.","questions":[{"text":"How do ecologists and social scientists study stability of communities and institutions, with positions attributed?","kind":"provenance"},{"text":"Which findings are contested?","kind":"boundary"}]}]}]},{"id":"learn","name":"Learn","description":"History and teaching.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How did the mathematical theory of stability develop from Lagrange and Lyapunov onward?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can stability be taught with demonstrations?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Explain stability in physical systems using criteria appropriate to their dynamics and constraints.","Check a model or system for stability within the user's authorization."],"mustNot":["Certify a structure, vehicle or control system as stable without proper analysis by a competent engineer.","Confuse the different technical senses of stability in safety-related work.","Present a system's past stability as a guarantee of future behaviour."],"requiresHuman":["Accepting a stability analysis for a design that people's safety depends on requires human oversight."]},"ethics":{"considerations":["Wrong stability claims about ships, structures or reactors have killed people."],"affectedParties":["Users of engineered systems are affected.","People near structures and machines are affected."]},"owners":{"steward":"Nobody: a property; engineers answer for stability claims about their systems.","roles":[],"masterSystems":[]},"relations":[{"target":"Q403605","type":"parent","note":"registry parent class"},{"target":"robustness","type":"related","note":"category"},{"target":"damping ratio","type":"related","note":"a parameter governing stability of oscillating systems"},{"target":"symbiosis","type":"related","note":"stable relationships in ecology"},{"target":"social safety net","type":"related","note":"programmes supporting family and social stability"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.stability","Wikidata: Q2325497 (https://www.wikidata.org/wiki/Q2325497)"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Time-response plots can show whether a disturbed physical system returns toward its equilibrium or steady state.","Phase-space diagrams can represent trajectories approaching a reference state.","Equilibrium is a reference state, while stability describes the system's response to disturbance.","Not physical; a property."]},"capabilities":{"applicability":"required","items":["explain the concept across fields","describe analysis and measurement","support modelling questions","support learning"]},"hazards":{"applicability":"required","items":["Conflating senses across fields","Assuming stability without analysis","Instability leading to collapse or runaway"]},"interfaces":{"applicability":"required","items":["Engineering stability criteria in design codes","Chemical stability testing standards","No regulation of the general concept"]},"context":{"applicability":"required","items":["Persistence or return after disturbance.","mechanical and structural stability","stability in control theory and linear stability","thermodynamic and chemical stability","colloidal, sedimentation and foam stability","ecological and social stability"]}},"sources":[{"title":"Wikidata item Q2325497: stability","url":"https://www.wikidata.org/wiki/Q2325497","note":"identity and sense of the item"},{"title":"Stability theory","url":"https://en.wikipedia.org/wiki/Stability_theory","note":"The response of a system's motion or equilibrium to disturbances."},{"title":"Lyapunov stability","url":"https://en.wikipedia.org/wiki/Lyapunov_stability","note":"Formal equilibrium stability, including asymptotic stability in which a disturbed system returns toward equilibrium."}],"openQuestions":["Should each specialised stability be a separate entry?","How should textbooks be linked?","How should standards be linked?"],"resources":{"spec":"/models/things/publications/thing-q2325497/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q2325497/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T06:14:37Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-08T18:54:38+00:00: completeness 1.00; sense: Wikidata description; 3 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}