That story is tucked away in the first chapter of the Gospel of John. Verses 41 and 42 state: "The first thing Andrew did was find his brother Simon and tell him, 'We have found the Messiah.' And he brought him to Jesus."
The procedure is relatively simple: Find something eternally important, tell someone about it right away, then take them to it. That's what Andrew did. Each of us can be a part of the Andrew Factor. Telling about Jesus and then bringing the one to whom you are talking to Jesus.
Most of the time, Christians are good about proclaiming Jesus. We just have trouble with the bringing part. We are afraid of offending or rejection, abhor being uncomfortable. Imagine what wouldn't have happened if Andrew hadn't brought Simon Peter to Jesus.
The Andrew factor tells about Jesus, asks for the commitment, then takes people to Jesus.