Pooling ACS 2006 through ACS 2008

I have to pool the Census ACS 2006 through ACS 2008 files.

I am a beginner and therefore would appreciate if anyone could explain the following:

  1. Is it fine to use 2008 ACS 3yr in this case?

  2. If not, how should I proceed ahead?

The 3-year sample is likely to be your best bet, since it can be used immediately for analysis without further adjustment. I suggest reading this FAQ on ACS multi-year samples.