Another such theory is X-bar analysis. In the most popular version of this theory, it is assumed that there are three levels of phrases: XP, X-bar, and X. Even this level is controversial. There is ...

It is less minimal than the second one we discuss. It is less minimal than the third one briefly discussed last. In the standard X-bar theory it is assumed that there are three levels: X, X-bar, and ...

There are three levels of autism spectrum disorder (ASD), which are described in the Diagnostic and Statistical Manual of ...