{ "model": { "rank": 2548, "code": "thing-q12511", "model_id": "vr.tr.stairs", "name": "stairs", "purpose": "Let an agent treat stairs as a building element governed by geometry, safety and accessibility rules, and know when stairs are a barrier that needs an alternative.", "family": "Thing Registry", "category": "Physical world and living systems", "status": "research-draft", "kind": "thing", "plane": "PHY", "domain": "PHY.BLT", "industry": "", "version": "", "url": "/models/thing/q12511/", "tier": 2, "score": 103, "payload": { "layer": "wikidata", "aliases": [ "stile", "monumental staircase", "ladder stile", "bicycle stairway", "workout stairs", "escape ladder", "fire escape", "Cantilevered stairs", "airstair", "altar ladder", "library ladder", "staircase range", "mobile ladder", "Himmelsleiter", "outdoor stairway", "concrete stairs", "Rainbow stairs", "horseshoe stair", "gangi", "mimi-ishi", "helical stairs", "boarding stairs", "alternating tread stairs", "hakokaidan", "metal stairs", "outdoor stairs in Seattle", "Mule ramp", "staircase renovation", "perron", "escalator", "Equestrian staircase", "back stairs", "spiral staircase", "ladder", "folding step", "Pas de souris", "moving staircase", "forked stairs", "grand staircase", "stone steps" ], "aliasCount": 78, "merged": 82, "knownIn": 103, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": "vr.tr.stairs", "source": { "dataset": "wikidata", "item": "Q12511", "url": "https://www.wikidata.org/wiki/Q12511", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-11T04:35:51Z", "providers": [ "Claude" ], "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify", "pass": 2, "wave": 1, "engine": "claude" }, "metaModel": { "id": "THING-Q12511", "registryId": "vr.tr.stairs", "name": "stairs", "version": "0.2.0-wave.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.BLT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q12511/", "model": { "registry_id": "vr.tr.stairs", "name": "stairs", "purpose": "Let an agent treat stairs as a building element governed by geometry, safety and accessibility rules, and know when stairs are a barrier that needs an alternative.", "definition": "A construction of steps that lets people move on foot between levels, made of treads and risers arranged in one or more flights, with landings and usually handrails.", "what_it_is_for": "Moving people on foot between floors or levels, and providing escape routes in emergencies.", "affordances": [ "climb and descend them, which some people cannot do", "design and build them, to building code geometry", "inspect them, for condition and compliance", "provide an alternative, such as a lift or ramp, where access requires one" ], "distinguishing_features": [ "Consistent step geometry, which is what makes stairs safe", "A building element with code requirements, unlike informal steps", "A barrier to wheelchair users and some others, needing alternatives", "Escape stairs have extra requirements for fire protection and width" ], "appearance": "A series of horizontal treads rising in equal steps, with risers between them, landings at intervals, and handrails or balustrades along open sides.", "visual_identification": [ "Regular treads and risers forming a flight", "Handrails and balustrades along the sides", "Stiles and ladders are related but steeper and treated differently by codes" ], "physical_properties": [ { "quantity": "riser height", "typical_range": "150-190", "unit": "mm", "note": "codes set maximum riser heights" }, { "quantity": "tread depth", "typical_range": "250-300", "unit": "mm", "note": "" }, { "quantity": "pitch", "typical_range": "25-42", "unit": "degrees", "note": "steeper than about 42 degrees is usually a ladder or ship stair" }, { "quantity": "handrail height", "typical_range": "850-1000", "unit": "mm", "note": "" } ], "families_and_kinds": [ "by shape: straight, L-shaped, U-shaped, spiral, curved", "by use: main, service, escape, external, monumental", "by material: timber, concrete, steel, stone", "related forms: stiles, ladders, escalators" ], "related_models": [ { "relation": "is part of", "target": "building", "why": "stairs are a building element" }, { "relation": "is alternative to", "target": "lift and ramp", "why": "accessibility requires alternatives" }, { "relation": "is regulated by", "target": "building code", "why": "geometry, guarding and fire rules" }, { "relation": "is confused with", "target": "escalator", "why": "an escalator is a moving machine with its own standards" } ], "identifiers": [], "standards_and_regulation": [ "National building codes on stair geometry and guarding", "Fire codes on escape stairs", "Accessibility standards such as ISO 21542" ], "failure_modes_and_hazards": [ "Falls, among the most common causes of injury at home", "Irregular risers or worn treads that trip people", "Missing or low handrails and guarding", "Blocked escape stairs" ], "in_scope": [], "out_of_scope": [], "characteristics": [] }, "sources": [], "structure": { "bundles": [ { "id": "geometry", "name": "Geometry", "description": "Rise, going and pitch.", "rationale": "Consistent geometry is what makes stairs safe to use.", "layers": [ { "id": "steps", "name": "Steps", "description": "Riser and tread dimensions.", "findings": [ { "id": "steps-finding", "name": "Step dimensions", "description": "The measured riser and tread sizes.", "questions": [ { "text": "What are the riser height and tread depth, and are they consistent?", "kind": "measurement" }, { "text": "Do they comply with the applicable code?", "kind": "boundary" } ] } ] }, { "id": "layout", "name": "Layout", "description": "Flights, landings and width.", "findings": [ { "id": "layout-finding", "name": "Stair layout", "description": "Flights, landings and clear width.", "questions": [ { "text": "How many flights and landings are there, and how wide is the stair?", "kind": "measurement" }, { "text": "Is headroom sufficient along the whole flight?", "kind": "measurement" } ] } ] } ] }, { "id": "safety", "name": "Safety", "description": "Guarding and slip resistance.", "rationale": "Falls on stairs cause serious injuries, and most causes are designable out.", "layers": [ { "id": "guarding", "name": "Handrails and guarding", "description": "Rails and balustrades.", "findings": [ { "id": "guarding-finding", "name": "Guarding provision", "description": "Handrail and guard heights and continuity.", "questions": [ { "text": "Are handrails and guards present, continuous and at the right height?", "kind": "measurement" }, { "text": "Can a child climb or pass through the guarding?", "kind": "boundary" } ] } ] }, { "id": "surface", "name": "Surface", "description": "Slip resistance and visibility.", "findings": [ { "id": "surface-finding", "name": "Surface condition", "description": "Nosings, contrast and slip resistance.", "questions": [ { "text": "Are the treads slip resistant, with visible nosings?", "kind": "measurement" }, { "text": "Is lighting adequate?", "kind": "measurement" } ] } ] } ] }, { "id": "access-and-escape", "name": "Access and escape", "description": "Who can use them and in emergencies.", "rationale": "Stairs exclude some people and are the escape route for others.", "layers": [ { "id": "accessibility", "name": "Accessibility", "description": "Alternatives for those who cannot use stairs.", "findings": [ { "id": "accessibility-finding", "name": "Alternatives provided", "description": "Lifts, ramps or evacuation aids.", "questions": [ { "text": "What alternative exists for people who cannot use these stairs?", "kind": "action" }, { "text": "How are they evacuated in an emergency?", "kind": "action" } ] } ] }, { "id": "escape", "name": "Escape role", "description": "Fire protection and capacity.", "findings": [ { "id": "escape-finding", "name": "Escape provision", "description": "Whether the stair is an escape route and its protection.", "questions": [ { "text": "Is this an escape stair, and how is it protected from fire and smoke?", "kind": "definition" }, { "text": "Is it kept clear?", "kind": "measurement" } ] } ] } ] }, { "id": "construction-and-condition", "name": "Construction and condition", "description": "What it is made of and its state.", "rationale": "Material and condition decide maintenance and risk over time.", "layers": [ { "id": "material", "name": "Material", "description": "Structure and finishes.", "findings": [ { "id": "material-finding", "name": "Construction", "description": "The structure and finishes.", "questions": [ { "text": "What is the stair made of, and how is it supported?", "kind": "definition" }, { "text": "What load is it designed for?", "kind": "measurement" } ] } ] }, { "id": "condition", "name": "Condition", "description": "Wear and damage.", "findings": [ { "id": "condition-finding", "name": "Condition survey", "description": "Wear, damage and repairs needed.", "questions": [ { "text": "What wear or damage is present?", "kind": "measurement" }, { "text": "Who is responsible for repairs?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Should escape stairs be a separate entry from stairs in general?", "How should accessibility alternatives be linked to stairs in a building model?", "Which geometry rules should the model carry across jurisdictions?" ], "statistics": { "bundles": 4, "layers": 8, "findings": 8, "questions": 16 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "building, structure or infrastructure", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a stairs, record what state it is in, and decide what may be done with it.", "whatItIs": "Let an agent treat stairs as a building element governed by geometry, safety and accessibility rules, and know when stairs are a barrier that needs an alternative.", "characteristics": { "substance": "material", "origin": "manufactured", "agency": "inert", "mobility": "fixed", "scale": "built" }, "whatYouCanDoWithIt": [ "observed and measured", "entered, crossed or travelled along" ], "distinguishingFeatures": [ "Names folded into this entry, which a task may need to split apart again: stile, monumental staircase, ladder stile, bicycle stairway, workout stairs, escape ladder, fire escape, Cantilevered stairs, airstair, altar ladder, library ladder, staircase range.", "82 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.", "Described in 103 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a stairs, and on what evidence are they told apart?" ], "whatItIsMadeOf": "matter you can touch", "physicalCharacter": [ "On the scale of a building: sited rather than moved.", "Stays where it was put; moving it is a project.", "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state", "enter it, cross it, travel along it" ], "howItIsRecognised": [ "Recognised by form, materials and siting, and confirmed by address or by a register entry rather than by looking." ], "relatedModels": [ { "relation": "covers", "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.", "targets": [ "stile", "monumental staircase", "ladder stile", "bicycle stairway", "workout stairs", "escape ladder", "fire escape", "Cantilevered stairs", "airstair", "altar ladder", "library ladder", "staircase range" ] } ], "standing": "Described in 103 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 82 finer distinctions are held inside this entry as names rather than as separate models.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one stairs from another, and a stairs from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a stairs sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a stairs from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "form-and-composition", "name": "Form, composition and condition", "description": "What a stairs is made of, what shape and size it takes, and what state it is in.", "rationale": "A physical thing can be measured, and a model that cannot record its measurements cannot support any decision that depends on them.", "layers": [ { "id": "form-and-dimensions", "name": "Form and dimensions", "description": "Shape, size, mass and the ranges these take across examples at built scale.", "findings": [ { "id": "measurable-dimensions", "name": "Measurable dimensions and their units", "description": "The quantities worth recording and the units they are recorded in.", "questions": [ { "id": "measurable-dimensions-q01", "text": "What identifies and describes the dimensions of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "measurable-dimensions-q02", "text": "Who or what asserted this about the dimensions of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "measurable-dimensions-q03", "text": "What may an agent decide or do once the dimensions of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "material-and-composition", "name": "Material and composition", "description": "Materials, parts and how they are put together.", "findings": [ { "id": "parts-and-materials", "name": "Parts and materials", "description": "What a stairs is built from and which parts are replaceable.", "questions": [ { "id": "parts-and-materials-q01", "text": "What identifies and describes the composition of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "parts-and-materials-q02", "text": "Who or what asserted this about the composition of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "parts-and-materials-q03", "text": "What may an agent decide or do once the composition of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "condition-and-integrity", "name": "Condition and integrity", "description": "Wear, damage, health and the difference between working and broken.", "findings": [ { "id": "condition-assessment", "name": "Condition, damage and health", "description": "How the condition of a stairs is judged and by whom.", "questions": [ { "id": "condition-assessment-q01", "text": "What identifies and describes the condition of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "condition-assessment-q02", "text": "Who or what asserted this about the condition of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "condition-assessment-q03", "text": "What may an agent decide or do once the condition of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "place-and-movement", "name": "Place and movement", "description": "Where a stairs is, how it got there and where it may go (fixed).", "rationale": "A thing that can move needs its position recorded with a time, or every later claim about it is about a place it has left.", "layers": [ { "id": "location-and-placement", "name": "Location and placement", "description": "Position, containment and the reference frame the position is given in.", "findings": [ { "id": "position-and-frame", "name": "Position, container and reference frame", "description": "Where a stairs is, and what that position is measured against.", "questions": [ { "id": "position-and-frame-q01", "text": "What identifies and describes the location of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "position-and-frame-q02", "text": "Who or what asserted this about the location of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "position-and-frame-q03", "text": "What may an agent decide or do once the location of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "movement-and-transfer", "name": "Movement and transfer", "description": "How a stairs is carried, installed or relocated.", "findings": [ { "id": "movement-events", "name": "Movement events and constraints", "description": "What counts as a movement, what records it and what limits it.", "questions": [ { "id": "movement-events-q01", "text": "What identifies and describes the movement of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "movement-events-q02", "text": "Who or what asserted this about the movement of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "movement-events-q03", "text": "What may an agent decide or do once the movement of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a stairs passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a stairs between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a stairs, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a stairs is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "use-and-operation", "name": "Use and operation", "description": "What can be done with a stairs and what it takes to do it.", "rationale": "An agent that can recognise a thing but not act on it has only half a model.", "layers": [ { "id": "intended-use", "name": "Intended use and function", "description": "What a stairs is for, and what it is used for anyway.", "findings": [ { "id": "function-and-purpose", "name": "Function, purpose and misuse", "description": "The function a stairs performs and the uses that fall outside it.", "questions": [ { "id": "function-and-purpose-q01", "text": "What identifies and describes the use of a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "function-and-purpose-q02", "text": "Who or what asserted this about the use of a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "function-and-purpose-q03", "text": "What may an agent decide or do once the use of a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "handling-and-procedure", "name": "Handling and procedure", "description": "The steps, skills and tools involved in using a stairs.", "findings": [ { "id": "procedures-and-skills", "name": "Procedures, skills and required tools", "description": "What an agent needs before it can act on a stairs at all.", "questions": [ { "id": "procedures-and-skills-q01", "text": "What identifies and describes handling a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "procedures-and-skills-q02", "text": "Who or what asserted this about handling a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "procedures-and-skills-q03", "text": "What may an agent decide or do once handling a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "structure-and-capacity", "name": "Structure, materials and capacity", "description": "How stairs is built and how much it can take.", "rationale": "Capacity and structural type govern what may lawfully happen inside or on it, and both are attested rather than obvious.", "layers": [ { "id": "construction", "name": "Construction and materials", "description": "Structural type, materials and principal dimensions.", "findings": [ { "id": "construction-record", "name": "Structural type and dimensions", "description": "What it is made of and how big it is.", "questions": [ { "id": "construction-record-q01", "text": "What structural type and materials characterise stairs, and what are its principal dimensions?", "kind": "measurement" }, { "id": "construction-record-q02", "text": "What in that construction limits how it may be altered?", "kind": "boundary" } ] } ] }, { "id": "capacity-and-load", "name": "Capacity and load", "description": "Occupancy, load ratings and their basis.", "findings": [ { "id": "capacity-record", "name": "Rated capacity and who set it", "description": "The limits and the authority that certified them.", "questions": [ { "id": "capacity-record-q01", "text": "What capacity or load is stairs rated for, under which code, certified by whom?", "kind": "provenance" }, { "id": "capacity-record-q02", "text": "What must an agent refuse to permit beyond that rating?", "kind": "action" } ] } ] } ] }, { "id": "tenure-and-condition", "name": "Ownership, permitting and condition", "description": "Who holds stairs, what it is permitted for, and what state it is in.", "rationale": "A structure is not the organisation that uses it, and its permission to exist is separate from its condition.", "layers": [ { "id": "tenure", "name": "Ownership and permission", "description": "Title, occupancy and the permits in force.", "findings": [ { "id": "tenure-record", "name": "Title, occupier and permits", "description": "Who owns, who occupies, and what is permitted.", "questions": [ { "id": "tenure-record-q01", "text": "Who owns and who occupies stairs, and which permits or consents are in force?", "kind": "definition" }, { "id": "tenure-record-q02", "text": "What distinguishes the structure from the organisation that operates in it?", "kind": "boundary" } ] } ] }, { "id": "inspection", "name": "Condition and inspection", "description": "Inspection regime, defects and remaining service life.", "findings": [ { "id": "inspection-record", "name": "Inspections and defects", "description": "What is inspected, how often, and what was found.", "questions": [ { "id": "inspection-record-q01", "text": "What inspection regime applies to stairs, at what interval, and by whom?", "kind": "provenance" }, { "id": "inspection-record-q02", "text": "What finding takes it out of service, and who may authorise its return?", "kind": "action" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a stairs came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a stairs and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a stairs is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a stairs, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a stairs, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a stairs is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 8, "layers": 17, "findings": 19, "questions": 53 } } } }