Hi all,
I was just wondering what the difference between the blue and green slip?

In my opinion:

White = It's over, case sent back to the US. Next: get married and file for K-3 if an appeal process is failed also.
Blue = Very Bad: need a lot more works to resolve, more evidence are requested, missing document in the file, or simply just a way to delay your case for unknown reason. It's one of the many tools at HCMC's disposal!
Green = Not so so Bad: Basically, you are passed but the CO needs to further review your case, just to cross all T's and dot all I's, sometimes ask few more questions and for few more document.
Pink = You know it, girls love pink, and so do we! Visa granted.

my observation while interview in VN consulate office is :
- blue seems the additional requirements from petioner: additional tax forms, evidence of bonafide relationship..
- green seems the requirement evidence from beneficiary: haven't got police record, or medical document...
however, some person got green/blue for requirements from both petioner and benificiary
all is assumption.

From our experience, the blue slip is only given post-interview when they want more info or have some delay. The green slip is given at all other times after that. For example, when you provide info required by a blue slip, but there is still some problem, then you get a green slip. It's always a green slip when you are in "overcome" status, until your SO gets another interview or gets the visa.