The IAAO Standard on Data Quality defines quality requirements for critical elements of
assessment data and provides guidance for meeting those requirements for use in mass appraisal.
Assessment data for the purposes of this standard can be separated into property characteristic,
economic, and geographic.
This standard addresses quality for both the collection of new inventory and the management of
existing inventory. For all types of assessment data, this standard outlines the general requirements
for accuracy, currency, consistency, and completeness. Specific local standards should be
developed in accordance with this general standard.
This standard is concerned with data as an input into the assessment process. It is not intended to
provide guidance for data related to the state of an assessment process (e.g., inspections and other
operational processes) or other secondary uses. Assessors should decide whether to include these
factors in the development of their own local standards.

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• Education & TeachingTeacher ResourcesEducation TheoryAssessment

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