What is the procedure to immigrate to ITALY from INDIA? What are the Rules and Documents required?

A Person is living in Italy on a Valid Visa and having a Work Permit,
He wants to take his wife and Kids, along with him now.
What are the formalities he needs to fulfill in India regarding documentation etcetra that he requires to fulfill?
The detalis regarding this is important, please help. Thanx a lot in anticipation of an answer.

Answer:
Here Ministero degli Esteri site, the page with the all the infos you need (in Italian, English, French and Spanish): http://www.esteri.it/visti/index_eng.asp...
Here you can choose the appropriate options:
http://www.esteri.it/visti/home_eng.asp...
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