Concurrent validity

Concurrent validity is like when you want to know if two things are similar, and you check them both at the same time to see if they match up.

For example, let's say you want to know if a new test is good for measuring how smart someone is. You can give the new test and a test that is already known to measure intelligence to the same group of people at the same time. If the scores on both tests are similar, that means the new test has concurrent validity, which means it's just as good as the old test at measuring intelligence.

It's like when you're baking cookies and you want to make sure your measurements are correct. You have two different cups that you think hold the same amount of flour. You fill one cup with flour, and then you fill the other cup with the same amount of flour at the same time. If both cups have the same amount of flour, then the cups have concurrent validity, which means they both measure the same amount of flour.

So, concurrent validity is when you compare two things at the same time to see if they measure the same thing.