Snagging is the process of identifying and recording minor defects and unfinished items, typically as a project approaches practical completion, and tracking them to close-out.
A good snag record is specific: location, description, photograph, responsible party, date raised and date closed. Vague lists produce arguments; photographic, dated lists produce completed work.
Snagging data is also management information. Recurring snag types by trade or area point at process failures worth fixing on the next job rather than re-fighting on every one.