In construction and project management, a deficiency is work that fails to meet contract specifications, quality standards, or code requirements and must be corrected by the contractor. Deficiencies are identified during inspections throughout construction and formally documented in deficiency lists (also called punch lists) before project completion and final payment. Common deficiencies include incomplete finishes, improper installations, missing components, or work not matching approved drawings. Contractors typically must correct deficiencies at their own expense within specified timeframes. Municipalities managing construction projects retain a portion of payment (holdback) until deficiencies are resolved. The warranty period after project completion allows additional time to identify deficiencies that weren't immediately apparent, such as leaks or equipment failures.