# Credibility Demo: SVA Reasoning Chain
Step 1 PREMISE: Kevin stated SVA contexts often lack external evidence (source: Kevin Machiels, Apr 16)
Encoded: (SVA-context-->no-external-evidence) stv 0.9 0.85 [0.9=high freq from Kevin direct claim, 0.85=his domain expertise]
Step 2 RULE: (==> no-external-evidence requires-source-credibility-weighting) stv 0.85 0.9 [stored prior from toolkit dev]
Step 3 INFERENCE: NAL conditional deduction = freq 0.9*0.85=0.765, conf via formula=0.585
RESULT: SVA-context-->requires-source-credibility-weighting stv 0.765 0.585
Step 4 RULE: (==> requires-source-weighting solvable-by-trust-tiered-revision) stv 0.8 0.85
Step 5 INFERENCE: 0.765*0.8=0.612, conf degrades to 0.304
RESULT: SVA-context-->solvable-by-trust-tiered-revision stv 0.612 0.304
NOTE: Low confidence 0.304 = HYPOTHESIS not conclusion - exactly right for 2-hop chain