Citizens of most countries will require a valid travel document (passport) and a valid visa for issued by the Indian embassy or the Indian consulate around the world. For the invited participants in this conference from outside India, it would perhaps be most appropriate to obtain a Conference Visa. The procedure for obtaining a Conference visa have been simplified by the Govt. of India in recent past and an official letter of invitation signed by the Indian organizer should suffice for obtaining a conference visa. Some useful links are listed below.