Hi! My team(3 developers) will be building a Silverlight LOB application. This is the first Silverlight project for us. We've been doing mostly Winforms. We'll be using Silverlight4 / VS2010 / possibly WCF RIA Services, and ASP.NET Web application to handle authentication and host the silverlight pages.

We need a way to..

1. Modularize the silverlight project so we can work in different parts of the application, then integrate them.
2. Dynamically load different parts of the application, so the initial download size of the xap file wouldn't be too large.

After some research, I found out that Prism and MEF are possible solutions to these goals. Can you give me advice on which framework to use? or possibly another solution? We don't have much experience on Silverlight and the project needs to be finished in 3 months, so the learning curves for frameworks should be considered.

Thank you for reading! Any inputs will be much appreciated.