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|Abstract=In a series of publications, [[Hasok Chang]] makes the case that activities carried out by epistemic agents form the basis of the scientific enterprise. This paper provides an action-based scientonomic perspective of scientific practice. I define ''epistemic action'' as an action of an epistemic agent that involves an epistemic element and highlight the difference between global and local actions. The availability of a local action to an epistemic agent amounts to the agent employing the norm that the local action is permissible/desirable. To unearth the mechanism by which local actions become available to epistemic agents, I derive ''the local action availability theorem'', according to which, a local epistemic action becomes available to an agent only when its permissibility is derivable from a non-empty subset of other elements of the agent’s mosaic, i.e., from that agent’s employed norms and accepted theories. This framework is then applied to the emergence of the local action of determining the composition of chemical substances by weighing as practiced by Lavoisier and his followers; it is shown that the respective norm became employed in accord with the local action availability theorem.