{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.change-relation","code":"thing-change-relation","url":"https://ver.cy/models/thing/change-relation/","name":"change","alternateNames":["difference","gradient","concentration gradient","gravity gradient","temperature gradient"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"noun.relation","plane":"XCT","domain":["XCT.REL"],"industry":[],"navPath":"","tags":[],"facets":{"substance":"abstract","origin":"conceptual","agency":"inert","mobility":"not-applicable","scale":"not-applicable","affordances":["observable"]}},"whatItIs":"A relational difference between states, especially before and after an event, or across space, such as a gradient in temperature, concentration or gravity; measured as absolute or relative change, rate of change or spatial gradient.","purpose":"Let an agent handle change and gradients by quantity, measurement and interpretation, avoiding confusion between absolute, relative and rate-based changes.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Difference between states","Temporal or spatial","Absolute or relative","Drives processes such as diffusion"],"structure":{"bundles":[{"id":"measure","name":"Measure","description":"How much change.","layers":[{"id":"absolute","name":"Absolute","description":"Difference.","findings":[{"id":"absolute-finding","name":"Absolute","description":"Absolute change.","questions":[{"text":"What is the absolute change between the two states?","kind":"measurement"},{"text":"In which units?","kind":"definition"}]}]},{"id":"relative","name":"Relative","description":"Percentage.","findings":[{"id":"relative-finding","name":"Relative","description":"Relative change.","questions":[{"text":"What is the relative or percentage change?","kind":"measurement"},{"text":"Is the baseline appropriate?","kind":"boundary"}]}]}]},{"id":"gradients","name":"Gradients","description":"Spatial change.","layers":[{"id":"gradient","name":"Gradient","description":"Slope.","findings":[{"id":"gradient-finding","name":"Gradient","description":"Gradient.","questions":[{"text":"What is the gradient over this distance?","kind":"measurement"},{"text":"Which direction is it steepest?","kind":"definition"}]}]},{"id":"processes","name":"Processes","description":"Flows.","findings":[{"id":"processes-finding","name":"Processes","description":"Driven processes.","questions":[{"text":"Which process does this gradient drive, such as diffusion?","kind":"definition"},{"text":"How fast?","kind":"measurement"}]}]}]},{"id":"interpretation","name":"Interpretation","description":"Trends.","layers":[{"id":"trend","name":"Trend","description":"Signal versus noise.","findings":[{"id":"trend-finding","name":"Trend","description":"Trend.","questions":[{"text":"Is the change a real trend or random variation?","kind":"boundary"},{"text":"Which statistical test applies?","kind":"provenance"}]}]},{"id":"visual","name":"Visual","description":"Charts.","findings":[{"id":"visual-finding","name":"Visual","description":"Visualisation.","questions":[{"text":"Does the chart present the change fairly?","kind":"boundary"},{"text":"Is the axis truncated?","kind":"boundary"}]}]}]},{"id":"senses","name":"Senses","description":"Disambiguation.","layers":[{"id":"money","name":"Money","description":"Coins returned.","findings":[{"id":"money-finding","name":"Money","description":"Money sense.","questions":[{"text":"Is change as returned money or coins meant?","kind":"boundary"},{"text":"Which entry fits?","kind":"action"}]}]},{"id":"social","name":"Social","description":"Social change.","findings":[{"id":"social-finding","name":"Social","description":"Social change.","questions":[{"text":"Is social or organisational change meant?","kind":"boundary"},{"text":"Which entry fits?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Calculate and report change as absolute, relative or rate, stating the baseline used.","Separate measured change from noise and state the uncertainty."],"mustNot":["Confuse percent change with a change in percentage points.","Choose a baseline or time window to make a change look larger or smaller than it is.","Present random fluctuation as a trend.","Imply that a change was caused by something without evidence."],"requiresHuman":["Publishing figures of change that will inform a public or medical decision."]},"ethics":{"considerations":["Misreported change misleads people about risk, prices and policy results."],"affectedParties":["Readers of statistics","People affected by decisions based on them"]},"owners":{"steward":"Nobody owns the concept; whoever publishes a figure answers for it.","roles":[],"masterSystems":[]},"relations":[{"target":"oewn-00032220-n","type":"parent","note":"registry parent class"},{"target":"relation","type":"related","note":"category"},{"target":"percentage and derivative","type":"related","note":"measures"},{"target":"diffusion and heat flow","type":"related","note":"processes"},{"target":"magnitude relation","type":"related","note":"comparison"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.change-relation","Open English WordNet: oewn-13881240-n"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Before and after values","Gradients and slopes","Money given back as change is a different sense","Not physical; seen in comparisons, slopes and maps."]},"capabilities":{"applicability":"required","items":["compute absolute and relative change","compute gradients and rates of change","interpret trends carefully","visualise change clearly"]},"hazards":{"applicability":"required","items":["Confusing percent and percentage points","Misleading baselines","Mistaking noise for trend"]},"interfaces":{"applicability":"required","items":["ISO 80000 quantities"]},"context":{"applicability":"required","items":["Describing differences over time and space in science and data.","absolute change","relative and percentage change","rate of change","spatial gradients","concentration and temperature gradients"]}},"sources":[{"title":"Open English WordNet 2024, synset oewn-13881240-n","url":"https://en-word.net/id/oewn-13881240-n","note":"sense and gloss of the concept"},{"title":"Wiktionary: change","url":"https://en.wiktionary.org/wiki/change","note":"word senses and usage"}],"openQuestions":["Should gradient types be separate entries?","How should change metrics be linked?","How should the money sense be split off?"],"resources":{"spec":"/models/things/publications/thing-change-relation/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-change-relation/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T11:32:52Z","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 2026-10-07T12:16:27+00:00: completeness 1.00; sense: WordNet gloss; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}