>However there may be the individuals who changed the jobs where different frameworks were the standard, and such people might know several frameworks thorougly.

Hi Nick,
In cases like that, you begin to learn the new framework and your skills with the previous framework begin to deteriorate. You would no longer follow the progression of the other framework so would be out of date very quickly.

My point was that many have tried several frameworks but I don't know of any who are fluent in more than 1 or 2 at a time. If you are an independent, you know one or two and use those. Corporate life is usually entrenched in one framework. If you bounce around, you may have been an expert in a particular framework at the time, but 18 months later and a version upgrade or two, and I don't see the expert status remaining.

This is all my opinion and if there are framework "supermen/superwomen" out there who use three or more frameworks on a regular basis, I SALUTE YOU!!

>I myself worked with 2 frameworks - Codebook 3.0,(which I didn't like :) and Visual Extend 5 and 6 (Which I mostly like, however sometimes it might be slow because it's very elaborated and has a lot of code in base classes).
>

Why didn't you like Codebook? Do you think you would like any of the Codebook offspring? I think MM and VFE have their roots sprouting from this tree (I could be wrong).