1. A Design-Based Approach to Improve External Validity in Welfare Policy Evaluations. (August 2017) Authors: Tipton, Elizabeth; Peck, Laura R. Other Names: Westbrook T'Pring R. guest-editor. Journal: Evaluation review Issue: Volume 41:Number 4(2017) Page Start: 326 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗