Conventional framing
Variation is typically understood as random genetic mutation and recombination, providing the raw material upon which natural selection acts.
APS reframing
APS broadens variation to include all sources of organised difference emerging from biological processes. Variation is not purely random but arises within the structured dynamics of development, organism–environment coupling, and constraint-based organisation. These differences are not arbitrary but reflect the viability conditions under which living systems persist.
Key Point
Variation in APS is the structured reorganisation of viability-oriented organisation—the generation of differences that emerge within and are constrained by the conditions of persistence.