Data quality assessment is how an administrator determines whether Salesforce customer records are complete, current, consistent, unique, and actually used, starting from how the business uses that data rather than from a random report. A data management plan then sets standards for creating, processing, and maintaining records so naming, formatting, lifecycle including archiving, ownership, privacy, and monitoring are explicit. Required fields, validation rules, flows, page layouts, dashboards, Duplicate Management, custom field types, and trusted-source enrichment are how that plan is enforced in Salesforce.