 Validity of measurement or measurement validity whichever way you'd like to call it But the first things first folks Let's give you the most simple straightforward definition possible and we can just stop the video right there Are you measuring what you intend to measure? You do not measure my length Sorry, you did not measure my length I guess I could not measure my length with a with a bathroom scale Okay, it might be very reliable, right? It could be completely reliable and by the way reliability is a necessary component of validity You have to be reliable in order to be valid, but it's not the only component, right? So you're not going to measure my height with a bathroom scale, right? That's an invalid measurement It's not it's it's not a valid measurement tool for that particular construct You're trying to measure length then or height then you need to them use something that has I don't know like a I don't know a tape measure, but make sure your tape measure isn't made out of elastic Because a tape measure made out of elastic it may be measuring the right thing, but it's not going to give you a reliable score So it's not going to be valid So measurement validity measure what you intend to measure and make sure that there's reliability as a component