...Gary Ritter; Marc Holley The use of random assignment can be effective and appropriate in the evaluation of programmes that serve children in schools. Because random assignment creates pre‐treatment equality between treatment and control groups, this methodology is particularly effective...

...Judith Gueron This article presents lessons from social experiments in the US over 30 years testing employment and training, welfare reform and social service programmes and systems. It discusses the challenges in implementing a random assignment study and strategies to overcome them, and also sets...

... on these issues might find it helpful to start with the books discussed in the review article by Hobbs and colleagues in this special edition (p40). Random assignment in programme evaluation and intervention research: questions and answers Mark Dynarski1 and Patricia Del Grosso2 Abstract This brief article seeks...