# Concrete-vs-Abstract Responsibility Split

> Partition the family's behavior into what is invariant across every member (the topology preserved under substitution) and what varies per member (the novelty); the invariant set becomes the concrete base, the variant set becomes the abstract seam. The concrete/abstract boundary is derived from the evidence, not read off a fixed lifecycle vocabulary — so the split holds for any paradigm, not only OOP class lifecycles.

Record: `algorithms:concrete-vs-abstract-responsibility-split`
Kind: algorithm
Canonical: https://banes-lab.com/ontology/algorithms#algorithms-concrete-vs-abstract-responsibility-split
Closure: https://banes-lab.com/json/records/algorithms/concrete-vs-abstract-responsibility-split/closure

Listed in [Algorithm contracts](https://banes-lab.com/api/records/algorithms.md), after [Base-Class Candidate Selection](https://banes-lab.com/records/algorithms/base-class-candidate-selection.md) and before [Template Method Lifecycle](https://banes-lab.com/records/algorithms/template-method-lifecycle.md).

## Domain

- [Pattern distillation](https://banes-lab.com/records/algorithms-domain/pattern-distillation.md)

## Stage

- [project](https://banes-lab.com/records/stage/project.md)

## Axis

- [reasoning](https://banes-lab.com/records/reasoning/axis-reasoning.md)

## Tier

- [process](https://banes-lab.com/records/vocabulary/domain-tier-process.md)

## Grounds

- [substrate-node:invariant](https://banes-lab.com/records/reasoning/substrate-node-invariant.md)
- [ont-novelty](https://banes-lab.com/records/reasoning/node-ont-novelty.md)

## Math type

- [Algebra](https://banes-lab.com/records/reasoning/math-type-algebra.md)

## Force

- [Contract compatibility](https://banes-lab.com/records/force/contract-compatibility.md)
- [Control coordination](https://banes-lab.com/records/force/control-coordination.md)
- [Modularity](https://banes-lab.com/records/force/modularity.md)

## Linked from

- [The derivation loop](https://banes-lab.com/ontology/reasoning/reasoning-loop-derivation-loop.md)
- [The axes](https://banes-lab.com/ontology/reasoning/the-axes.md)
- [The nodes](https://banes-lab.com/ontology/reasoning/the-nodes.md)
- [The mathematics](https://banes-lab.com/ontology/reasoning/the-mathematics.md)
- [Domain tiers](https://banes-lab.com/ontology/schema/the-vocabulary-domain-tier.md)
- [The forces](https://banes-lab.com/ontology/schema/the-forces.md)