In APS, developmental stability does not mean the absence of change, flexibility, or responsiveness.
Living developmental systems remain viable precisely because they are capable of adjustment, compensation, and adaptive regulation.
Development therefore achieves stability dynamically rather than mechanically.
Organisms encounter continual variation throughout development:
- environmental fluctuations,
- material disturbances,
- signalling variation,
- injury,
- resource limitations,
- and internal organisational perturbations.
Yet development often continues successfully because regulatory processes compensate for disruption while preserving overall viability-oriented organisation.
This is why developmental systems commonly exhibit:
- robustness,
- resilience,
- plasticity,
- redundancy,
- and adaptive reorganisation.
A rigid developmental system would often fail under changing conditions. Stability in living systems instead depends upon controlled flexibility within viability-preserving constraints.
Developmental organisation therefore balances:
- persistence and adaptation,
- continuity and transformation,
- stability and responsiveness.
APS accordingly treats developmental stability as an active organisational achievement rather than static structural preservation.
Living systems persist not by resisting all change, but by regulating change in ways that preserve viability across time.