Assessment
The property record, valuation, appraisal intake, listings and property tax.
What is the collateral, and what is it worth?
The category runs from the physical record to the number. The property record is the parcel-level fact set every other product here reads; appraisal and listing are two independent opinions of value with different failure modes; valuation blends them; tax carries the assessed position and its history.
Products
In the order the value chain runs.
How the chain fits together
Physical characteristics come from the assessor's record rather than a listing, because listing fields are agent-entered, inconsistent between markets, and absent entirely for a property never offered for sale. The later and larger expression of the same decision is the property model under Data.