Validation begins by naming the claim, its admissible domain, its comparison, and the evidence that would falsify it. The reusable workflow is:
state the mathematical or semantic contract;
compute with the public API under an explicit configuration;
compare against an independent analytic result, limiting case, reference implementation, convergence study, or finite-difference check;
record metric identity, value, units, and tolerance;
state the limitation and the warranted claim.
For detailed workflows, use Auditing derivatives for AD versus finite differences, Provenance for reproducible research for reproducibility, and Evidence and claim boundaries for separating evidence classes. The Scientific evidence index then connects registered artifacts to the claims they actually support.
Self-consistency alone is insufficient. A successful transform, finite value, or fresh generated file does not establish scientific validity without the independent comparison required by the named contract.