Fr. Dominic, the bread monk, demonstrates how to tell if a loaf is fully baked using three different methods: baking time, gently tapping the crust of the loaf, and using a thermometer. Transcript: Hi, I'm Father Dominic the Bread Monk, author of How to Be a Breadhead and this is a Breadhead Minute.
The difference is that in a quasi-experiment the criterion for assignment is selected by the researcher, while in a natural experiment the assignment occurs 'naturally,' without the researcher's intervention. Quasi experiments have outcome measures, treatments, and experimental units, but do not use random assignment.
This guide, written by Howard White and Shagun Sabarwal for UNICEF looks at the use of Quasi-Experimental design and methods in Impact Evaluation. The paper provides a brief overview and then provides an outline of when it is appropriate to use and some of the ethical and practical limitations of its use.