This guideline presents current good practices in the development of efficient yet thorough procedures for any exposure reconstruction project. Its focus is on the industrial hygienist’s role and integration with other contributors in exposure reconstruction projects. It addresses alternative approaches, data source considerations, exposure metrics, quality assurance, and appropriate documentation for possible future retrospective exposure data needs. Provided checklists will help ensure the collection of necessary information needed for later exposure assessment work and data analysis.Content:Front Matter Table of Contents1. Introduction2. Consider Study Design3. Identify Scope of Reconstruction4. Establish Data Collection Protocols5. Identify and Search Data Sources6. Select Exposure Metrics and Group Exposures7. Develop Exposure Estimates8. Conduct Quality Assurance Activities9. Maintain Exposure Assessment Documentation ReferencesAttachments