In the dedication Luke explains his method of research

Luk 1:1-4

1 As a number of

In his introduction John pictures Christ as the Word (Logos)

Joh 1:1-18

1 From the first he was the Word, and the Word was in relation with God and was God.
2 This Word was from the

Apparently Joseph’s genealogy in Matthew and Mary’s in Luke

Mat 1:1-17

1 The book of the generations of Jesus Christ,

The annunciation of the birth of the Baptist to Zacharias

Luk 1:5-25

5 In the days of Herod, king of Judaea, there was a certain

The annunciation to the virgin Mary of the birth of Jesus

Luk 1:26-38

26 Now in the sixth month the angel Gabriel was