Original Title: Quality Assurance Quality Control Qa Qc Guidance For Laboratory Dredged Material BioassaysThis report summarizes proceedings of a workshop on Quality Assurance and Quality Control (QA/QC) in laboratory bioassays of dredged material. The workshop was sponsored by the U.S. Army Engineer Waterways Experiment Station (WES). Attendees included individuals from academia, industry, and government with expertise in sediment toxicity testing and/or QA/QC. Topics included data quality objectives; biological procedures; sample handling storage and shipment; data recording, reduction, validation, and reporting; internal quality control checks; and corrective action. The report provides generic guidance under each of these topic headings. Appendices to the report include sample checklist, data reporting forms, chain-of-custody sheets, and laboratory testing contract indemnification forms. Comparability, Completeness, Corrective action, Data quality, Data validation, Laboratory sediment bioassays, Performance criteria, Quality assurance, Quality control.