While Fed. R. Civ. P. 23(a)(1), the “numerosity” requirement, is not a frequently challenged issue in many class actions, its importance cannot be ignored. Rule 23(a)(1) mandates that in order to ...

Rule 23(a) numerosity is one of the less frequently litigated class certification requirements, which makes the U.S. Court of Appeals for the Seventh Circuit’s recent decision in Anderson v. Weinert ...

Most people learn to count and do basic arithmetic at a young age and don’t give these skills a second thought. But numerosity or numeracy, the ability to think about and use numbers, is more than a ...

While some experiments try to test animals' perception of quantities in natural settings, others use training paradigms that offer experimenters more control over the conditions. All face the obstacle ...