The introductions "establish the songs in mood, time, and place" and "point up the significance of the songs and highlight their most important elements."

The introduction of Phillip Bauer early in the season quickly established that Jack did not inherit his rectitude from his father.

The partial deregulation and introduction of competition for long-distance phone services has established other methods of determining call pricing that do not necessarily follow the traditional model.

Neither introduction established a viable population.

Even in work settings, the introduction of the internet has established easier and sometimes more practical forms of communicating.

The introduction of the proscenium arch in Italy during the 17th century established the traditional theater form that persists to this day.

His unpublished introduction to Sons and Lovers established the duality central to much of his fiction.

(Australia does not have a single naturally occurring cyprinid species; unfortunately, the illegal introduction of carp has now established the family's presence in Australia.)

The introduction establishes melodic, harmonic, and/or rhythmic material related to the main body of a piece.

Their introduction of the "Speedee Service System" in 1948 established the principles of the modern fast-food restaurant.