This is an admittedly lazy request for help.

I've tended to shy away from discussing the different subtypes of validity
for animal models because I've always felt that the boundaries are blurry and the definitions inconsistent across authors--especially when it comes to predictive validity vs. construct validity.

Would some smart TIPster kindly provide me with (or point me toward) a brief history of the way these and similar terms have been used and misused over the years? I know the basics; what I need is a guide to the gray areas, if that makes sense.

thanks,
David Epstein
[EMAIL PROTECTED]

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