Part 1 deals primarily with that of receipt and verification that the signal is indeed from an extraterrestrial source. In part 2, we deal with another possible way of meeting aliens; direct contact. This means that contact is visible and without a warning. For instance, a giant alien ship appears over one of Earth's largest cities with no prior warning.
Check it out at What Happens if We Receive an Alien Signal - Part 2, and I know some of you will want to make your voice known on this subject.