Approved Alternative Catalog¶
Reference document — instantiates Acceptable Substitution Mapping
Maintains a reusable list of substitutes that have already passed validation, so an urgent decision reaches for a pre-vetted stand-in instead of re-deciding.
An Approved Alternative Catalog is a living document that stores the results of past substitution decisions: for each requirement it covers, it lists the stand-ins already cleared for use, the conditions attached to each, and a date past which the entry must be re-confirmed. Its defining move is that it is a reuse cache, not a validating engine — it does not re-argue whether an alternative is acceptable, it records that the argument was already won and hands the answer back instantly the next time the same gap appears. That makes it fast under pressure and dangerous when neglected, because a catalog's whole value rests on someone keeping it current: an entry that was safe last year but silently expired is exactly how a stale approval becomes a live hazard.
Example¶
A hospital pharmacy runs into a national shortage of a common injectable. This is not the first time, and the pharmacy is not deciding from scratch. It keeps an approved-alternatives catalog: for each drug at risk, a short list of therapeutically acceptable substitutes that a review committee has already vetted — a different concentration, an equivalent agent, a compounded preparation — each carrying its conditions ("dose per weight, not per vial"; "not for pediatric use"). When the shortage hits at 2 a.m., the on-call pharmacist doesn't reconvene the committee; they pull the catalog entry, confirm it hasn't lapsed, apply the stated conditions, and dispense. The catalog names a pharmacist owner who reviews entries quarterly and whenever the manufacturer, the evidence, or a regulation changes — so when one listed substitute is itself recalled months later, the entry is pulled before anyone reaches for it. The value is speed with a paper trail: a defensible stand-in, available in the moment, that nobody had to improvise.
How it works¶
What makes this a catalog rather than a one-off memo is that it is organized for lookup and built to decay gracefully:
- Indexed by requirement, not by product. You look up "the thing I can't get" and find what may stand in for it, so the document answers the question a decision-maker actually arrives with.
- Entries carry conditions, not just names. Each listed substitute records the caveats under which its approval holds, so reuse reproduces the original judgment rather than a stripped-down version of it.
- Every entry has an expiry and an owner. An approval is stored with the date and trigger that force it back to review, and a named maintainer answerable for keeping the list honest.
- It stores verdicts; it does not reach them. The validation happens in a review elsewhere; the catalog is where a cleared verdict is filed for the next person.
Tuning parameters¶
- Coverage breadth — how many requirements get a pre-approved list. Wide coverage pays off under frequent shortage but multiplies the maintenance burden and the number of entries that can rot.
- Entry granularity — a single blanket substitute versus several conditioned options per requirement. Finer entries handle more real cases but take longer to author and to keep current.
- Staleness window — how long an approval stands before it must be re-confirmed. Short windows keep the list trustworthy but raise churn; long windows are cheap until the day a lapsed entry is used.
- Add-authority — who may enter a new approved substitute. Tight control protects quality; loose control fills gaps faster but invites unvetted entries.
- Pruning aggressiveness — how readily lapsed or unused entries are removed versus kept "just in case." Aggressive pruning keeps the catalog lean and current; timid pruning grows a graveyard of half-trusted options.
When it helps, and when it misleads¶
Its strength is turning a solved problem into a resource: substitutions vetted once become available to everyone, immediately, with their conditions intact — the mechanism that makes therapeutic interchange[n1] and its cousins workable at the speed a crisis demands. It also creates accountability, because each entry is owned and dated rather than living in one veteran's head.
Its characteristic failure is the stale catalog: the list keeps returning yesterday's answer after the world moved, so a substitute that is now unsupported, recalled, or out of spec is still handed back as "approved." The tidy authority of a catalog entry is precisely what discourages the second look that would catch this. The classic misuse is treating the list as permanent — adding entries and never expiring them — until the document quietly describes a reality that no longer exists. The discipline that guards against it is the pairing this mechanism insists on: no entry without an owner and an expiry, and a real update trigger on the events (supply, evidence, regulation) that can invalidate an approval overnight.
How it implements the components¶
The catalog realizes the storage-and-upkeep slice of the archetype — it keeps cleared substitutions reusable and current, and nothing about establishing them:
fallback_alternative_catalog— it is the fallback store: the maintained list of pre-approved stand-ins to reach for when the preferred option is unavailable.update_trigger— each entry carries an expiry and the events that force re-review, so the list decays on purpose rather than by surprise.substitution_owner— every entry is assigned an accountable maintainer, so no approval is anonymous or orphaned.
It does not establish which alternatives are equivalent or on what evidence_or_validation_criterion, nor curate the acceptable_bundle_set in the first place — that is the Equivalency Table, its nearest twin: the table settles equivalence, the catalog files the result. Nor does it adjudicate a new proposed swap under a decision_boundary_and_review_rule — that is the Procurement Equivalence Review.
Related¶
- Instantiates: Acceptable Substitution Mapping — it makes vetted substitutes legitimate and fast by storing them for reuse.
- Consumes: Procurement Equivalence Review and Equivalency Table — the catalog files the substitutes those mechanisms clear.
- Sibling mechanisms: Equivalency Table · Conjoint or Tradeoff Survey · Design Tradeoff Curve · Indifference Map · Preference Elicitation Workshop · Procurement Equivalence Review · Service Tier Mapping · Substitution Matrix · Exception Review Workflow
Editorial Notes¶
Form Classification¶
Form family: Representation, Specification & Plan
Rationale: Maintains a reusable list of substitutes that have already passed validation, so an urgent decision reaches for a pre-vetted stand-in instead of re-deciding, making its operative form a non-executable information artifact that externalizes static or prospective structure.
Independent corroboration: The frozen evidence defines Approved Alternative Catalog as 'Maintains a reusable list of substitutes that have already passed validation, so an urgent decision reaches for a pre-vetted stand-in instead of re-deciding', so its operative form is Representation, Specification & Plan.
Review outcome: Independent reviewer agreement; high confidence.
Origin Attribution¶
Primary origin: Medicine & Healthcare
Origin pattern: Convergent development
Present-day reach: Multi-domain
Rationale: Formulary and therapeutic-interchange practice provides the clearest named tradition of keeping previously approved alternatives, their conditions, and governance ready for immediate reuse.
Related originating lineages:
- Engineering & Design — Qualified alternates are established configuration-control artifacts.
- Logistics & Supply Chain Management — Approved supplier and substitute-part lists provide an independent lineage.
Review resolution: ASHP defines therapeutic interchange as authorized exchange under previously approved written formulary protocols, closely matching the page's canonical example. Federal acquisition rules independently maintain prequalified product and source lists and require reexamination when specifications or products change, confirming engineering and supply-chain convergence. Medicine is selected as primary because the article's conditions, expiry, and immediate substitution logic most directly track formulary practice, while the generalized catalog is an Encyclopedia synthesis.
Attribution caveat: Clinical formularies provide the clearest primary lineage for this page, while engineering qualified-products lists and supply-chain approved-source systems are independently established convergent forms.
Encyclopedia synthesis: The exact catalogued form synthesizes established practice rather than reproducing a single standard historical label.
Review outcome: Researched adjudication after independent review; medium confidence.
Sources consulted:
- ASHP Guidelines on the Pharmacy and Therapeutics Committee and the Formulary System
- Federal Acquisition Regulation Part 9: Qualified Products and Sources
- NASA SLS EEE Parts Management and Control Requirements
Notes¶
[n1] Therapeutic interchange is the formulary-authorized practice of dispensing a pre-approved, therapeutically equivalent drug in place of the one prescribed, under protocol. It is the canonical instance of an approved-alternatives catalog: a standing committee vets the equivalence once, and pharmacists act on the stored approval without per-case re-approval. ↩