Why few pages in JSP & few in OAF

Hi all,
Why are few modules developed in OAF (XMLs) and few modules developed in JSPs. Are these pages developed in JSPs also called OAF Screens ?
Why is this difference among the screens in the same application ? Is there any special reasons/advantages for few screens in JSPs ?
There is a OAF Dev Guide document, which helps in developing OAF screens, is there any other guide similar to that in help to develop/customize screens out of JSP.
Would appreciate if anyone could throw some light..

JTT/JTF frameworks were used by CRM modules (mainly sales and marketing) as that was the framework that was available to CRM dev teams, ERP teams on the other hand used OA, which was the FWK of their choice.
with CRM and ERP merging into EBiz, JTT/JTF was no longer being enhanced and most of the new pages were developed in OAF, that is the reason you would see a mix of both in a single module at times.
On how to personalize the jsp pages which are non-OA, i have tried to put the clarifications in this thread, there is no single way of doing so and would depend on varis factors.
Personalize JSP page
Thanks
Tapash

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