BW and BW-SEM - Separating landscapes

Hi,
We currently have a single landscape for both BW and BW-SEM running BW 3.1 and SEM 3.2.
Now we have been asked to looking into separting BW and SEM to separate landscapes.
We need advice/recommendations on whether they should stay together or be separated.
Any body went through similar decision making process?
If so what decision you made and why?
Best Regards
Srini

David,
If your BW and SEM are on a single landscape, there is no need to separate it if performance is not an issue and you are okay to be tied to the SEM release cycle. 
As Marc has said, BW 3.5 needs SEM 4.0 but if you split it, the SEM 4.0 system still needs and come with its own BW 3.5 system and you have to worry about RFC,etc.  With BI Integrated Planning coming up, I would tend to recommend having a single set of landscape rather than seperate BW and SEM systems unless there is a compelling reason to split them.

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