Receiving Converts into the Orthodox Church

The method by which the Orthodox Church receives converts is a very controversial topic, and one which has provoked much online discussion. Should a convert be received by baptism, by chrismation alone, or perhaps simply after a recantation of previously-held errors? All three methods have been used in the past. And which groups should be received in which ways? Should the Oriental Orthodox (such as Copts and Armenians) be received in the same way as Pentecostals? What about Roman Catholics? The issue is far from clear, and has usually generated much more heat than light.