Precautions to be followed while designing a Cube

Hi All,

Can someone please explain me the below.

1.what care should we take while designing a cube ?.

   Apart from Line Item dimension, do we have any other things that can be taken care?

2 What utmost care should we take while designing DSO, so that we wont miss any data?

3. Can we do compression and then later aggregation ? Is there any link between aggregation and compression sequence?

4. What is the advantage if i use hybrid provider ? its just a combination of DSO and Cube., this can be done via Multiprovider. Why there is a need to use Hybrid Provider?