The Concordance originated as a privately printed fandom publication by Dorothy Jones Heydt in 1968.

[2] In 1969, Trimble edited and self-published The Star Trek Concordance, covering the first two years of the series.

[3] In the Introduction to the Ballantine Concordance Trimble explains the origins of the book: About midway through the first season of Star Trek, I noticed that Dorothy Jones [Heydt], a fellow fan, was making extensive notes on the show, with cross-references to items and things mentioned, lists of who played what part, and so on.

But due to Ballantine's concerns, at the time, of waning interest in Star Trek, it was decided to not reprint the book.

Integrated into the front cover is a moving wheel which cross-references episodes by title, star date, "call letters" and page in the book.

In it Heydt explains her contribution to the Concordance, as well as Roddenberry's concept of the stardate: A function of space as well as time, being influenced by a starship's position in the galaxy, its course and velocity.

The Lexicon chapter is an extensive and exhaustive alphabetical encyclopedia of characters, planets, ships, medicine, weaponry, etc., used in the series.

of Charles Lutwidge Dodson (1832–98): English writer best remembered for his famous children's books Alice's Adventures in Wonderland (1865) and its sequel, Through the Looking Glass both illustrated by Sir John Tenniel.

The characters from the Alice books are frequent manifestations on the shore-leave planet, probably because of their popularity with members of the crew... (OUP/a,[7] SL[8])[4]According to Richard Arnold, at the time he came to Paramount in the mid-70s, The Making of Star Trek and the Concordance were the only references in use.