Starfleet Records. Fleet Ranks. First officer. Duties. Noted functions of the first officer aboard a Federation starship are: Obey and implement the captain's orders. Sources as examples: TOS: "The Enterprise Incident"; TNG: "Gambit, Part II"; DS9: "Paradise Lost". Star Trek. Live the experience. | Starfleet Command

Starfleet Records. Fleet Ranks. First officer. Duties. Noted functions of the first officer aboard a Federation starship are: Following the promotion of Acting Ensign Wesley Crusher in 2364, Captain Jean-Luc Picard told Crusher, that while he waited for his acceptance into Starfleet Academy, "you will learn this ship–every operation, every function," and that Commander William Riker would prepare a duty schedule for him, "heavy on study". Source: TNG: "Where No One Has Gone Before". Star Trek. L