People claim their passports have been voided without their knowledge. Here's how to check the status of your passport before ...

Sometimes, passports are not valid for entry to the Schengen Area even if they are well short of the expiry date Is your passport valid for your next trip? Or do you risk being turned away at airport ...

In my previous blog post, I noted that reliability and validity are two essential properties of psychological measurement. Measures of intelligence, personality, vocational interests, and so forth ...

There is a distinction that one learns about on the first day of a course in psychological research methods. It is the difference between internal and external validity. Internal validity is ...