{"abstention_reason":null,"arm":"SUBSTRATE_DIVERSE_P2","candidate_id":"stock_flow_accumulation_control__library_information_science__SUBSTRATE_DIVERSE_P2","cell_id":"stock_flow_accumulation_control__library_information_science","decision":"PROPOSAL","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","proposal":{"actors":["Collection-space and shelving managers responsible for open-stack capacity","Facilities staff responsible for shelf anchoring, floor loads, fire egress, and accessibility","Selectors and collection managers whose acquisitions consume shelf space","Stacks staff who shelve, shift, withdraw, and transfer physical volumes","Conservation staff responsible for safe packing density and book support","Patrons whose access can be impaired by overcrowded or displaced collections"],"affected_objective":"Maintain a physically distributed reserve of usable open-stack shelf length so collections can grow and circulate without overcrowding volumes, obstructing access, exceeding structural or fire-safety constraints, or displacing books into unmeasured carts and workrooms.","arm":"SUBSTRATE_DIVERSE_P2","authority_safety":{"authorized_first_step":"The collection-space manager may conduct a reversible four-week measurement pilot on one representative open-stack range by attaching non-adhesive calibrated shelf-edge rulers and placing loose, standardized reserve blocks only in already empty shelf segments. No volume may be withdrawn, relocated across collections, compacted beyond conservation guidance, or denied shelving during this step.","decision_authority":"The collection-space manager owns measurement. Facilities and conservation staff must approve gauge placement and packing limits; the head of collections must authorize collection shifts, transfers, acquisition-location changes, or capacity construction; the accessibility or safety officer must approve any change affecting reach, aisle width, egress, or accessible browsing.","excluded_actions":["Discarding, withdrawing, transferring, or relocating collection materials solely to make the pilot appear successful","Placing reserve blocks where they compress, deform, conceal, or destabilize volumes","Using aisles, floors, carts, workrooms, staff offices, or emergency-clearance zones as unmeasured overflow capacity","Exceeding floor-load, shelf-load, fire, seismic, conservation, or accessibility limits","Restricting patron access or changing collection-development commitments without the responsible authority","Treating nominal shelf length obstructed by braces, oversize volumes, book supports, or unusable reach zones as available capacity","Installing powered sensors, automated controls, or permanent shelving alterations during the initial pilot"],"halt_rollback":"Remove the reversible rulers and reserve blocks and restore the prior shelf arrangement if they damage or compress materials, create unstable gaps, obstruct labels or access, reduce required book support, encourage overflow outside the boundary, or conflict with facilities, fire, seismic, conservation, or accessibility requirements. Preserve the measurements, record the failure, and do not authorize collection shifts until the boundary and safety constraints are corrected."},"baseline":"Compare the instrumented range with current space-planning practice based on annual acquisition and withdrawal counts, occasional visual estimates of percent full, and emergency shifting after a range becomes crowded. The baseline lacks a physically calibrated, distributed measure of remaining usable shelf length, a reconciliation of that reserve against space-consuming and space-releasing flows, and a protected spatial buffer that makes local depletion visible before shelves are packed.","candidate_id":"stock_flow_accumulation_control__library_information_science__SUBSTRATE_DIVERSE_P2","causal_chain":["Each accessioned, returned-from-bindery, or transferred-in physical volume consumes usable linear shelf length within a bounded stack range.","Withdrawals, transfers out, and approved moves to other permanent housing release shelf length, while shifts between bays redistribute rather than create total capacity.","When space-consuming length exceeds released length, the stock of usable empty shelf centimetres persistently declines even if the current acquisition rate later falls.","Aggregate building-level vacancy can conceal nonlinear local exhaustion because empty length in another classification range may not be usable without a collection shift.","Calibrated shelf-edge rulers expose actual empty length, while standardized physical reserve blocks occupy and visibly protect a predeclared portion of that empty space from routine shelving.","Monthly reconciliation of measured reserve change against the linear length added, removed, and transferred distinguishes true depletion from redistribution, measurement error, and overflow displacement.","Crossing a reserve-block or packing-density threshold provides physical evidence for an authorized reflow, transfer, withdrawal review, or capacity project before overcrowding damages materials or pushes books into hidden locations.","Repeated physical measurement verifies whether usable reserve returns to its target band and remains distributed where expected rather than appearing only through off-shelf overflow."],"cell_id":"stock_flow_accumulation_control__library_information_science","consequence":"A range can reach effective capacity despite moderate current acquisitions, producing tightly packed or leaning volumes, unsafe handling, inaccessible call-number sequences, repeated labor-intensive shifts, and hidden overflow on carts or in workrooms. Building-wide vacancy figures may remain reassuring even though usable reserve has been exhausted where collection growth occurs.","diversity_from_prior_proposals":"This opportunity controls depletion of a spatial stock—usable empty linear shelf length in public physical stacks—through passive measuring instruments and physical reserve barriers. P1 instead controls accumulation of uncleared born-digital content in preservation staging through repository workflow reconciliation. The affected problem, materials, actors, intervention, flows, thresholds, and causal path are therefore materially different: distributed physical-capacity depletion and overcrowding here versus digital accession backlog growth and preservation clearance in P1.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","intervention":"Instrument one bounded open-stack range with non-adhesive calibrated shelf-edge rulers and standardized, visibly marked spacer blocks representing a protected reserve of usable empty shelf length. Define the stock as physically usable empty centimetres after excluding braces, required book-support gaps, oversize incompatibilities, unsafe reach zones, and mandated clearances. Once per month, directly read that stock by bay and reconcile its change with measured linear centimetres accessioned or transferred in minus centimetres withdrawn or transferred out; record internal shifts separately because they redistribute capacity. Set a conservation-approved target band for total reserve and a minimum reserve per subject segment. The spacer blocks physically occupy the reserve band during routine shelving and provide a passive threshold when ordinary placement reaches them. Threshold crossings may support, but do not themselves authorize, collection reflow, transfer, withdrawal review, acquisition-location adjustment, or compliant capacity expansion. Continue measurements after any authorized action and inspect carts, sorting areas, workrooms, and adjacent ranges for displaced stock.","mechanism_mapping":[{"counterfactual_removal":"Without direct reconciliation, a change in apparent fullness could be attributed incorrectly to acquisitions even when internal shifts, oversize conversion, measurement error, or off-shelf displacement caused it.","mechanism_slug":"stock_flow_balance_reconciliation","role":"Relates monthly change in physically usable empty centimetres to centimetres added, removed, and transferred across a stable stack boundary."},{"counterfactual_removal":"Without the calibrated rulers and reserve blocks, staff would continue inferring the remaining spatial stock from acquisition rates or subjective visual fullness rather than measuring its level.","mechanism_slug":"stock_level_buffering","role":"The standardized blocks physically preserve a conservation-approved portion of empty shelf length as a distributed spatial buffer against routine encroachment."},{"counterfactual_removal":"Without a physical threshold, gradual local depletion could remain inconspicuous until shelves were already overpacked or overflow had accumulated elsewhere.","mechanism_slug":"accumulation_threshold_alert","role":"Contact with the marked reserve blocks and ruler bands makes depletion of total or segment-level reserve directly observable before effective capacity is exhausted."},{"counterfactual_removal":"Without inspecting coupled locations, moving books to carts, workrooms, adjacent classifications, or inaccessible shelves could falsely appear to restore reserve.","mechanism_slug":"hidden_accumulation_probe","role":"Checks whether apparent shelf-space recovery has displaced physical volumes into unmeasured or unsuitable locations."},{"counterfactual_removal":"Without mapping measured threshold crossings to space-releasing actions, the instruments would document depletion but would not test whether feasible levers can restore the reserve stock.","mechanism_slug":"net_flow_lever_adjustment","role":"Connects verified reserve depletion to separately authorized reflow, transfer, withdrawal review, location adjustment, or compliant capacity expansion."}],"nearest_rivals":["Annual acquisition and withdrawal statistics that report flows but do not measure remaining usable shelf length","Visual estimates of shelf fullness that lack calibrated units, stable exclusions, and stock-flow reconciliation","A one-time collection shift that redistributes existing volumes without protecting or monitoring a continuing reserve","A weeding campaign undertaken solely to free space without testing whether subsequent net growth depletes it again","Installation of compact shelving that expands nominal capacity without distributed reserve thresholds or checks for floor loading, access, and induced growth","Shelf-reading or inventory work aimed at call-number accuracy rather than control of the remaining spatial-capacity stock"],"negative_tests":{"intervention_falsifier":"The intervention is falsified if calibrated readings and protected reserve blocks do not detect reserve depletion earlier or more accurately than baseline visual estimates, if measured threshold crossings fail to correspond to conservation-relevant crowding, or if apparent recovery is consistently explained by displacement onto carts or into other unmeasured locations rather than restored usable shelf capacity.","problem_falsifier":"The problem is absent if the bounded range has no persistent month-to-month depletion of usable empty shelf length, or if existing practice already measures distributed usable reserve in consistent linear units, reconciles it to all cross-boundary flows, protects an approved target band, and prevents hidden overflow.","risks":["Reserve blocks may consume scarce space without producing better decisions.","Poorly designed blocks could compress books, obscure labels, create unstable gaps, or impede browsing.","Linear centimetres may not capture oversize incompatibility, shelf height, weight, condition, or subject-location constraints.","Staff may move blocks without recording the change, corrupting the measurement boundary.","Managers may optimize the measured range by pushing books onto carts, into workrooms, or into another classification segment.","Collection shifts and transfers may reduce browseability or separate related materials.","Capacity responses may violate floor-load, fire, seismic, conservation, or accessibility requirements.","Pressure to restore reserve may bias withdrawal decisions against low-use, specialized, or historically marginalized collections."],"strongest_counterevidence":"A calibrated comparison showing that existing visual space estimates already predict conservation-approved crowding and all resulting capacity decisions as accurately and early as the physical gauges—and that no material overflow or local reserve mismatch occurs—would undermine the claim that instrumentation and protected reserve blocks add decision value."},"next_evidence_step":"Select one representative range and physically measure every shelf with a calibrated ruler before installing any reserve blocks. Record usable empty centimetres by bay, excluded nominal length, off-shelf volumes associated with the range, and four weeks of accessioned, withdrawn, and transferred linear centimetres. Then place reversible standardized blocks only in existing empty space, predeclare total and segment reserve bands, and repeat measurements weekly for four weeks. Compare instrument readings with independent blinded visual fullness estimates, reconcile predicted versus observed reserve change, inspect adjacent overflow locations, and hold a go/no-go safety review before authorizing any collection movement or permanent installation.","observable_state":"A dated physical range sheet reports usable empty centimetres by bay and subject segment, standardized reserve-block centimetres present, nominal but unusable shelf length and exclusion reason, centimetres accessioned or transferred in, withdrawn or transferred out, internal shifts, predicted and observed reserve change, reconciliation residual, packing-density warning status, off-shelf overflow location and length, authorized response, and the next direct-measurement date.","prior_art_status":"UNSEARCHED","problem":"Open-stack libraries often monitor annual acquisitions, withdrawals, or building-wide shelf occupancy without governing the persistent, spatially distributed stock of usable empty shelf length. Because local capacity is consumed in linear units, released unevenly, and obscured by shifts, oversize materials, unusable shelf segments, and off-shelf overflow, a classification range can exhaust its practical reserve even after acquisition rates decline and while aggregate vacancy still appears adequate.","proposal_index":2,"remaining_contrastive_claim":"The testable claim is that passive calibrated shelf gauges plus physically protected reserve segments identify consequential local capacity depletion and hidden displacement earlier and more accurately than annual flow statistics or visual fullness estimates, while remaining useful without software, algorithms, databases, or automated control.","revision_record":{"claim_changes":["Initial version; limits the claim to a bounded comparison of calibrated physical measurement and passive reserve protection against existing visual and annual-flow practices.","Initial version; makes no claim of novelty, prevalence, demand, or effect size."],"conceptual_changes":["Initial version; defines the controlled stock as usable empty linear shelf length rather than collection size or acquisition rate.","Initial version; treats internal shifting as redistribution and off-shelf placement as coupled displacement rather than genuine capacity creation.","Initial version; combines measurement instrumentation with a passive spatial buffer whose effect is independent of digital control."],"evidence_changes":["Initial version; prior art remains unsearched under closed-book conditions.","Initial version; the first evidence step uses direct physical measurement, a reversible pilot, blinded baseline estimates, and explicit overflow inspection."],"operational_changes":["Initial version; authorizes no withdrawal, collection transfer, acquisition restriction, permanent shelving modification, or automated control.","Initial version; requires facilities, conservation, safety, and accessibility review before consequential space changes."],"parent_version":null,"progress_targets_addressed":["Material independence from the sealed born-digital preservation-staging proposal","Explicit stock, linear unit, spatial boundary, owner, measurement source, and cadence","Separated inflow, outflow, redistribution, conversion, and displacement paths","Passive physical measurement and buffering as the essential causal substrate","Distributed target bands, packing thresholds, capacity constraints, and coupled-stock checks","Bounded evidence step, falsifiers, risks, authority limits, halt conditions, and rollback"]},"schema_version":1,"structural_mapping":[{"archetype_element":"Accumulated or depleted stock","domain_realization":"Physically usable empty linear shelf centimetres remaining within one bounded open-stack range; the stock depletes as collections consume capacity."},{"archetype_element":"Stock boundary, owner, unit, source, and cadence","domain_realization":"The collection-space manager owns a monthly centimetre ledger for designated bays, derived from direct readings of calibrated shelf-edge rulers and standardized reserve blocks."},{"archetype_element":"Inflow that depletes the reserve stock","domain_realization":"Accessioned volumes, returns from external binding or storage, and transfers into the range consume measured linear centimetres."},{"archetype_element":"Outflow or clearance that replenishes the reserve stock","domain_realization":"Authorized withdrawals, permanent transfers out, and moves to approved alternative housing release measured linear centimetres."},{"archetype_element":"Conversion and transfer paths","domain_realization":"Rehousing, new book supports, oversize reclassification, and altered shelf configuration convert nominal length into more or less usable length; internal shifts transfer empty space between segments without changing the range total."},{"archetype_element":"Net-flow balance","domain_realization":"Ending usable empty centimetres equal starting usable empty centimetres minus added and transferred-in centimetres plus withdrawn and transferred-out centimetres, adjusted for recorded configuration conversions and an explicit residual."},{"archetype_element":"Target band and thresholds","domain_realization":"A conservation-approved percentage or centimetre reserve is set for the range and a minimum is distributed across subject segments; marked reserve blocks and ruler bands show approach to the lower boundary."},{"archetype_element":"Buffering intervention","domain_realization":"Standardized physical spacer blocks occupy already empty shelf length, preserving the declared reserve from routine shelving and making encroachment mechanically and visually apparent."},{"archetype_element":"Control levers","domain_realization":"Separately authorized levers include reflow, permanent transfer, evidence-governed withdrawal review, acquisition-location adjustment, and safety-compliant capacity expansion."},{"archetype_element":"Nonlinearity and delay","domain_realization":"A small remaining aggregate reserve may be unusable when fragmented, in the wrong subject range, inaccessible, or incompatible with volume dimensions; acquisitions, withdrawals, shifts, and construction also affect the measured stock on different time scales."},{"archetype_element":"Hidden-reservoir and displacement check","domain_realization":"Carts, sorting areas, workrooms, adjacent ranges, inaccessible shelves, and temporary storage are measured so apparent reserve restoration is not credited when physical volumes have merely moved outside the nominal boundary."}],"substrate_contract":{"counterfactual_independence":"If all software, databases, dashboards, algorithms, digital routing, incentives, training programs, and automated controls are removed, calibrated shelf-edge rulers still directly measure empty length and standardized reserve blocks still physically occupy and protect the target spatial buffer. Human authorization supports consequential responses but does not create the instruments' measurement or buffering effects.","forbidden_channel_audit":"The essential effect does not come from governance, scheduling, staff incentives, metadata, computation, or a digital alert. Those channels may record readings or authorize later collection actions, but stock observability arises from direct physical measurement and reserve preservation arises from material occupation of shelf space. No physical noun substitutes for a rule-only or computational intervention.","primary_allowed_process":"HYBRID_OTHER_ALLOWED_PRIMARY"},"title":"Passive Shelf-Reserve Gauges for Physical Collection Capacity","version":0},"schema_version":1}