H1B, H4 Visa

I have attended visa interview at Chennai consulate on 7th April with my wife and my 7 month old son. Initially, we were worried how to feed him since they are not allowing any food items inside. But, to much of our delight, we were sent early in the queues (for both document verification and the actual visa interview).
This was a very pleasant surprise and whole process took just 30 minutes.
Coming to the actual interview, the officer was very polite. After initial greetings, he asked for my green folder and then my degree certificate. He verified my credentials using my roll number on the certificate. After that, he asked for the Client's name. Then, he took finger prints for both of us. Then, he asked me to show the letter from the client. I gave the client invitation letter. Then, he asked details of the project. When I was about to explain, he asked me documents for the same. I said I do not have them. After some time, he said that he needs some additional docs. to issue the visa. He handed over a slip to me which contains the list of the docs (technical description of the project, market analysis, itinerary of services). He said that my wife and child need not come next time and I can walkin any time on tuesday, wednesday and thursday.

This is my experience.

My sincere advise to all of you who are attending interview is that you make sure you carry
i. Client invitation letter (if you are going for client project)
ii. Contract Letter between the client and the employer
iii. Detailed Technical description of the project, timeline, current status, no. of employeees, market analysis etc.
iv. Itinerary of services

The visa officers are asking one of these docs and issue 221g if any of them is missing.

Good luck to all of you!!