Since 1975, immigration to Norway has been very limited and strictly regulated. As Norway’s population ages, this situation is gradually liberalizing, but for the moment not all foreigners are permitted to move to or work in Norway. The principal rule is that a residence visa and work permit are granted only if there is a demonstrable need to live and work in Norway, such as family reunification, cultural exchange, study or research, or to fill a specific Norwegian labor need unavailable in the domestic work force. Nordic nationals do not need residence visa or work permit in Norway.

This is just a sample of what you'll find in the complete Norway guide.