Stratified Treatment¶
Apply different interventions to different strata when a uniform treatment would be ineffective, unfair, or unsafe.
The Diagnostic Story¶
Symptom: The same treatment is applied to groups that differ systematically in ways that matter, producing overtreatment in some and undertreatment in others simultaneously. Aggregate success metrics look acceptable while subgroup outcomes are quietly failing. Operators quietly carve out informal exceptions because the uniform rule keeps producing predictable misfit at the same cases. When the exceptions are audited, they look arbitrary because the real classification logic was never formalized.
Pivot: Define meaningful strata based on the differences that produce misfit, assign cases to them using auditable rules, attach a differentiated treatment policy to each stratum, and govern the boundaries so the differentiation improves fit rather than becoming a mechanism for arbitrary unequal treatment.
Resolution: Overtreatment and undertreatment are reduced because treatment level matches the relevant variation. Subgroup outcomes become visible rather than hidden inside aggregate numbers. Informal exceptions are replaced by formal strata with explicit justifications, making the classification accountable rather than ad hoc.
Reach for this when you hear…¶
[clinical medicine] “The dosing protocol was designed for adults and we kept adjusting down for elderly patients informally — at some point the informal adjustment needs to become the protocol.”
[tax administration] “Small businesses and multinationals get the same audit form, which is pointless for both — the risk profiles are completely different and the treatment should be too.”
[conservation management] “We applied the same habitat intervention across all site types and it worked great on the mesic sites and failed on the xeric ones — the strata were right there in the site survey.”
When This Archetype Applies¶
Partial catalog groundingSome structural conditions are represented by existing abstractions, but no sufficient condition set is fully represented.
Diagnostic problem
A uniform intervention is misfit because relevant groups, layers, risk classes, capacities, or conditions differ systematically, yet the system is treating them as if they were interchangeable.
What this problem means
The structural problem is heterogeneous need under a uniform rule. The system is trying to govern, support, protect, inspect, educate, or serve cases as though they were interchangeable, but they differ in ways that change the appropriate treatment.
This creates a recurring mismatch. Some cases receive too much burden or intensity. Others receive too little support or protection. Operators begin creating informal exceptions because the official rule is too blunt. Meanwhile, averages hide which strata are succeeding and which are failing.
The deeper tension is between accountability and fit. A system needs rules stable enough to be explainable, but it also needs enough differentiation to avoid treating unlike cases as if they were the same.
Show the applicability expression
Applicability expression3 distinct conditions
groundedpartly groundedopen
3 conditions, all required.
3Required in every casenumbered 1–3
These hold no matter which pattern applies.
Systematic heterogeneity · open
Systematic heterogeneity
This is a load-bearing situation condition in the diagnostic expression. The condition is: Systematic heterogeneity. If it does not hold, this particular condition set is incomplete.
Predictable uniform-treatment misfit · grounded · any one of 5
Uniform treatment creates predictable misfit
Use Stratified Treatment when uniform treatment predictably misfits the field. The narrower requirement in this condition set is: Uniform treatment creates predictable misfit.
Classifiable relevant difference · needs review
A relevant difference can be classified
This is a load-bearing situation condition in the diagnostic expression. The condition is: A relevant difference can be classified. If it does not hold, this particular condition set is incomplete.
Other requirements and context (2)
Why these sit outside the expression
Supporting context — it may accompany or help interpret the situation, but it is not a load-bearing condition in a sufficient diagnostic set.
Deployment constraint — it constrains how the intervention must be deployed, not the situation that calls for it.
Supporting contextTreatment capacity or burden is consequential.
Deployment constraintFairness requires fit rather than sameness.
Coverage
1 of 3 conditions grounded · 1 open · 1 needing review.
Mechanisms / Implementations¶
- Risk Stratification Protocols: Assign cases to risk bands and connect each band to action.
- Clinical Risk Banding: Uses clinical indicators to separate patients into bands that receive different screening, follow-up, treatment intensity, or safety precautions.
- Tiered Service Catalogs: A tiered service catalog documents what different strata receive: response times, support levels, escalation paths, eligibility, or safeguards.
- Differentiated Instruction Plans: In learning systems, differentiated instruction plans vary scaffolds, practice, pacing, examples, or challenge level across learner strata.
- Vulnerability-Based Support Workflows: A vulnerability-based support workflow directs extra assistance, protection, or simplification toward strata with higher exposure or lower capacity.
- Stratum-Specific Threshold Schedules: A threshold schedule lists different cutoffs for escalation, review, inspection, eligibility, or intervention by stratum.
- Fairness Audits by Stratum: A fairness audit checks whether the differentiated treatment is producing intended fit without unacceptable under-service, exclusion, stigma, or disparate harm.
- Case Management Tiers: Assigns cases to light, standard, intensive, or specialist management tracks according to need, risk, or complexity.
- Differentiated Instruction Plan
- Fairness Audit by Stratum: Checks whether differential treatment is producing intended fit without unacceptable disparate harm, exclusion, or hidden under-service.
- Risk Stratification Protocol: Implements the archetype by assigning cases to risk bands and linking each band to monitoring, protection, escalation, or support rules.
- Segmented Customer Treatment Rules: Operationalizes different response scripts, service levels, retention offers, or escalation paths for different customer or case segments.
- Stratum-Specific Threshold Schedule: Lists different eligibility, review, escalation, inspection, or intervention thresholds for each stratum.
- Tiered Service Catalog: Documents the service levels, response times, supports, thresholds, and responsibilities associated with each stratum.
- Vulnerability-Based Support Workflow: Directs additional protection, outreach, simplification, or case management toward strata with lower capacity or higher exposure to harm.
Related Abstractions¶
Abstractions this archetype builds on — directly (a source ingredient) or as a related pattern. Links follow the typed catalog namespace.
Built directly on (4)
- Equity: Context-sensitive fairness.
- Resource Management: Allocation of finite assets.
- Set and Membership: Groups and categorizes elements.
- Stratification: Layered separation of a system.
Also references 5 related abstractions
- Boundary: Defines system limits.
- Classification: Sorting entities into discrete categories by explicit rules, turning unbounded variation into a finite, reusable map for downstream reasoning and action.
- Feedback: Outputs influence inputs.
- Governance: The durable architecture of authority, accountability, and decision rights through which a group makes binding collective choices and resolves disputes internally.
- Threshold: Safe vs harmful levels.
Variants¶
Narrower or domain-specific specializations that share this archetype's core structure. Recognized variants are established; candidate variants are provisional.
Risk-Stratified Treatment · subtype · recognized
Assign different monitoring, protection, escalation, or intervention intensity according to risk strata.
Vulnerability-Based Support · governance variant · recognized
Provide additional support or protection to strata with lower capacity, higher exposure, or greater vulnerability to harm.
Tiered Service Levels · mechanism family variant · recognized
Define service tiers with different response times, supports, privileges, safeguards, or escalation routes.
Differentiated Instruction · domain variant · merge review
Adjust learning supports, materials, pacing, practice, or challenge for learner strata while preserving a learning goal.
Dynamic Restratification · temporal variant · candidate
Periodically or continuously reassign cases to strata as their risk, need, response, or capacity changes.
Editorial Notes¶
Problem Classification¶
Classification: Adaptation, Variation & Context Misfit → Heterogeneous Case & Pathway Misfit
Problem kernel: systematically different groups receive one uniform intervention
Rationale: Earliest causal condition: A uniform intervention is misfit because relevant groups, layers, risk classes, capacities, or conditions differ systematically, yet the system is treating them as if they were interchangeable.
Independent corroboration: The earliest necessary condition in the frozen evidence is: A uniform intervention is misfit because relevant groups, layers, risk classes, capacities, or conditions differ systematically, yet the system is treating them as if they were interchangeable. That is a heterogeneous case and pathway misfit problem because Cases differ materially in scale, elasticity, pathway, distribution, regime, or treatment response, but a uniform route or intervention treats those differences as interchangeable.
Review outcome: Independent reviewer agreement; high confidence.