Science has provided an increasingly clear picture of the inherent limits in human visual perception and memory that can lead to errors in eyewitness identification. While the law enforcement ...

Those of us in the business of psychological measurement use the terms reliability and validity a lot. You've probably seen those terms on the Psychology Today website (they appear thousands of times) ...

Accurate quantification of physical activity energy expenditure is a key part of the effort to understand disorders of energy metabolism. The Actiheart, a combined heart rate (HR) and movement sensor, ...

But what are reliability and validity exactly, how do we assess reliability and validity, and why are these properties of psychological tests so crucially important? In this and a following blog post, ...