Sufficient conditions for extraterrestrial intelligence: ?Philosophical?and theological considerations. Sufficient conditions would include confirmation of extraterrestrial intelligence. Accordingly the SETI-projects of NASA and some universities?are explained and examined. The possibility of UFO's is taken into account and evidence evaluated. In respect of philosophical considerations, the validity of inductive strategies is investigated as well as?epistemological problems relating of rational communication. Theological considerations bring to the fore the imago Dei problem. It is concluded that in the light of both neccessary and sufficient conditions the issue?no longer is of a scientific fiction nature but is on a firm scientific path.
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