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Inspection Ladder

A passive observer rarely receives complete meaning directly from the wire. Interpretation accumulates gradually.

Visual Model

flowchart LR bits["Bits / symbols"] --> fields["Fields"] fields --> frames["Frames / words / sentences"] frames --> timing["Cadence / freshness"] timing --> authority["Semantic authority"] authority --> state["State hypothesis"] state --> limits["Known uncertainty"]

Binder Contract

Different protocols expose different parts of this ladder. CAN teaches arbitration before semantics. UART teaches framing hypotheses before bytes. ARINC 429 teaches labeled words before aircraft meaning. MIL-STD-1553 teaches transaction structure before application data. DBC teaches that the dictionary itself is the semantic step.

Source Notes

The ladder is a project teaching model, not a standards artifact. It helps reviewers check whether a page performs disciplined accumulation of evidence instead of jumping from bytes to certainty.

Teaching Simplification

The ladder is linear for readability. Real analysis loops backward: a timing clue may change the framing hypothesis, and a semantic dictionary may expose a wrong field decode.