Thanks a bunch Marty!!!

Yes this is my first program attempted. I've always found it best to jump into something and get your hands dirty. And I can't break nothing anyhow! HA!

You must be able to read between my lines of code!!! 'Cause I actually do have ten fields to validate! I spent most of the last hour or two reading up on IsNumeric function, based off of the first reply to my post.

On the main form, I have three frames, each housing a particular equation. Inside each frame I also have cmdButtons to calculate the equations. I found by using the code I placed in the Module, ALL of the fields in each of the three frames were checked and validated when any of the cmdButtons were pressed.

Being able to validate the fields inside a certain frame on the same main form, from which the cmdButton is clicked, is where I want to go with this program.

Should I place error checking codes within the each separate cmdButtons??? Or should I leave it in the Module and correct, debug and work through my problem there???

Your supplied code, and insight, has given me a better understanding of error checking already. Thanks for the time and effort on your part. :-)