### Question
How is the term impact evaluation research defined?


### Answer
The term **impact evaluation research** is defined in *22 U.S.C. § 8401* as the following:

> the application of research methods and statistical analysis to measure the extent to which change in a population-based outcome can be attributed to program intervention instead of other environmental factors

#### Citation:
  - *22 U.S.C. § 8401*
  - Heading: **CHAPTER 91-ENHANCED PARTNERSHIP WITH PAKISTAN**

