Here, the captain could engage in administrative work with all relevant office equipment at hand without interfering with bridge operations while having instant access to the bridge in the event of a crisis. In addition, this room was usually the preferred place where the captain could hold private discussions and/or receive classified communications.
In the absence of the ship's commanding officer, the use of the ready room accordingly fell to whichever officer was in command of the vessel at the time. (TNG: "The Arsenal of Freedom" etc.)
A short corridor outside the room was usually used as an access to and from the bridge, although it also led to the starship's network of corridors. (ENT: "Chosen Realm", "Affliction") The ready room was located to the aft of an emergency rescue hatch, as an exterior sign indicating this hatch's location was visible immediately below the ready room window. (ENT: "Shadows of P'Jem")
A version of Enterprise from an alternate timeline in which the vessel was sent back 117 years into the past retained its ready room until at least 2154. However, at that point, the room no longer had its sketches of Enterprise, as they had been replaced with various alien-looking artifacts. ("E²")
The set for Archer's ready room was intentionally built to be cramped. "Captain Archer's ready room was designed to have low ceilings, so we would see Scott Bakula have to bend over, a little bit, when he moved around in there," observed Visual Effects Producer Dan Curry. "That gave the impression about how valuable space is in this craft, just how it would be in a submarine." ("Silent Enemy" audio commentary, ENT Season 1 Blu-ray special features) The cramped quality of the set led the actors and production staff members to sometimes hit their heads on the ceiling. During production of Star Trek: Enterprise's first season, Chief Lighting Technician Bill Peets observed, "Because the set is so low, we have a running joke: Who hit their head today? Some people actually wear hard hats now because so many people have cold-cocked themselves and gotten a lump on their noggins, including the actors. When you get to this set you've got to be careful." (Star Trek: Communicator issue 138, p. 51) Some of the furnishings in the set for Archer's ready room came from a French designer. (citation needed • edit)
All the prints in the series of Enterprise illustrations were made by John Eaves, who, due to his own oversight, had only twenty-four hours to produce the drawings. A fifth, that of the World War Two carrier USS Enterprise (CV-6) was additionally slated to be part of the series, but had to be left out due to space restrictions on the wall.  Set Decorator James Mees recalled of the ready room, "We were trying to show that [Archer] was someone who had a past, a good past, and who remembered that past; that's what the show is so much about." (Star Trek: The Magazine Volume 3, Issue 3, p. 85
In the first draft script of "Shadows of P'Jem" (written while the episode had the working title "Untitled Andorians Return"), the ready room on Enterprise was used for a meeting between CommanderTucker, LieutenantReed, and Captain Sopek. In the final draft script and the final edit of the episode, the setting for that scene was changed to the situation room.
As evidenced by the final draft script of ENT: "Acquisition", a short, ultimately excised scene from that episode was to have shown a Ferengi named Ulis searching Captain Archer's ready room for the ship's vault.
In the final draft script of "E²", the ready room aboard the version of Enterprise from an alternate timeline was described thus; "In contrast to Archer's ready room, this one is a little run down, and is filled with Vulcan and alien artifacts (the Enterprise artwork has been removed)."
When CaptainChristopher Pike took command of Discovery, his ready room was set up on a separate part of the ship, disconnected from the bridge. It was larger than Lorca's and contained a large computer table, numerous wall mounted displays, as well as personal effects Pike brought from Mojave. (DIS: "New Eden")
Shortly after it was decided that the Galaxy-class would have a captain's ready room, Andrew Probert suggested placing the office area so that it opened onto the upper level of the bridge, to increase dramatic impact. At first, Gene Roddenberry agreed with this proposal. The reason the ready room was moved down to its eventual position was to facilitate a shorter, more direct route to the command chair. (Star Trek: The Next Generation Companion 3rd ed., p. 8)
The alcove where the replicator was located was supposed to open into a side corridor, leading to a bathroom. However, it was never shown on camera and a set was never constructed. The corridor, however, was briefly seen in TNG: "The Neutral Zone", showing Picard walking out of the corridor, back into the ready room proper. Also, the couch in Picard's ready room was actually constructed to slide out from the wall for use as a bed; though this function was never seen in use, it could occasionally be seen with the bed part either pushed too far into the wall or sticking out farther than intended.
An exterior shot looking into Picard's ready room, from TNG: "The Best of Both Worlds, Part II", "Darmok" and "Conundrum", showed the outside bulkhead of the ready room as squarish in shape. This did not match the configuration seen on the exterior model of the Enterprise-D. Also incorrect was the reflection in the window, proving a perspective that made it appear as though the ready room window actually faced forward.
In the film Star Trek Generations, the fish tank was seen blackened and apparently drained following the crash of the Enterprise. When asked what exactly had happened to Picard's fish, the producers admitted that it most likely perished in the crash.(citation needed • edit)
Many of the scenes involving conversations in Picard's TNG ready room were filmed independently from scenes on the bridge, meaning that the latter wasn't always fully dressed, when seen from inside Picard's ready room through the open door. Oftentimes this resulted in the bridge set outside the door not being fully "ready" as a real bridge would be; many times, particularly during the last two seasons, the emergency turbolift alcove directly across from the ready room alcove was not lit and, in many cases, the two forward consoles were not staffed. Also, there were many instances when an actor would come to speak with Picard actor Patrick Stewart and then leave the ready room set, with the camera (and, therefore, the audience) remaining in the ready room with Picard; through the open doorway, the departing actor could clearly be seen walking towards the viewscreen. Within the Star Trek universe, those actors would have been stepping into a solid wall where the viewscreen was; as it was, the nine-foot-tall cavity where the viewscreen supposedly stood was actually the means by which actors entered and left the set, as it opened directly onto the soundstage. Only in scenes specifically requiring the viewscreen to be seen was the bottom of the screen frame – discernible by two vertical separation lines near the corners where that part could be removed – attached, and either a bluescreen matte or a starfield drape placed outside, to give the illusion of an image.
The ready room's large painting of the Enterprise-D was created in 1987. While the sets for TNG were under construction, Andrew Probert and Rick Sternbach became interested in providing some form of decoration to fill up a large blank wall space which was over the couch in the newly designed ready room. "So Andy and I approached [Set Decorator] John Dwyer [...] and said, 'Something needs to be put over that couch,'" remembered Sternbach. "Then we volunteered to do a painting." Bearing in mind that captains' offices typically have some form of ship painting, Probert and Sternbach agreed it would be fun if the painting was an illustration of Picard's own vessel. Probert subsequently planned the picture's layout. Having no office computers, the pair of production staffers chose to render the image using traditional media, which were acrylics on eighth-inch Masonite. Sternbach painted the background then Probert painted the ship, impressing one another with their work. "We did it on our own time," said Probert, recalling the picture's creation. "Each of us took it home to work on. When it was ready, we loaned it to John to put in the captain's office." During the series run of TNG, many viewers were awed by the painting when they saw it on-screen but it was only ever mentioned in a single episode: by Berlinghoff Rasmussen in "A Matter of Time". Several prints and posters of the painting were publicly released after the series concluded. "The painting got around," noted Sternbach. (Star Trek: The Next Generation 365, p. 233) Although David A. Goodman regarded the TNG captain's office as "beautiful," he referred to the Enterprise picture as "terrible." ("The Forgotten" audio commentary, ENT Season 3 Blu-ray special features)
The Defiant ready room initially appeared as Admiral Ross's office on Starbase 375 in the beginning of Season 6 of Star Trek: Deep Space Nine. It was part of the set extensions created between seasons that saw the engineering set for the Defiant connected to the Mess Hall set on Stage 18.
On an Intrepid-class starship, the captain's ready room was located starboard of the main bridge, beside the tactical station.
The desk, which featured a work area and access console, was the focal point of the room, located in front of the main entrance door. A raised level in the front section of the room featured a small table, a curved couch, and a food replicator.
The bulkhead behind the couch featured three windows facing the bow of the ship. A port-facing door beside the main entrance provided secondary access to the room from a deck 1 corridor. (VOY: "Shattered")
A shelf beside the main work desk allowed the commanding officer to display personal belongings. Captain Kathryn Janeway, of the Intrepid-class USS Voyager, used this shelf to display various historical and archaeological items.
The windows aboard the USS Voyager were a reuse of the windows seen in Ten Forward aboard the USS Enterprise-D, simply flipped upside down. The same was true of Voyager's briefing room.
For the production of Star Trek: Insurrection, Captain Janeway's ready room was redressed for use as CounselorTroi's office (somewhat appropriately, since Janeway's couch was first seen on TNG in Troi's Enterprise-D office). The set was also modified for the Voyager episode "Author, Author", lit with darker tones and decorated not with historical and archaeological items, but with weapons of various designs.
Aboard Sovereign-class vessels, the ready room was located to the forward starboard side of the main bridge. It featured a small window looking out into space and a private entrance located off the bridge.
Captain Picard's ready room aboard the USS Enterprise-E featured a desk and small couch. It was decorated with items from the previous Enterprise, including his Mintakan tapestry.
It also contained a large, gold model of the Enterprise-E herself, along with the Enterprise-D, C, B, A and the original Enterprise. (Star Trek: First Contact)
While none of the TNG films ever really featured a clear shot of Captain Picard's ready room, publicity stills from Star Trek: First Contact did show evidence of the existence of a cylindrical-shaped fish tank that apparently did not make it into the final cut of that movie, nor any of the others.
The room was mostly unchanged in Star Trek: Insurrection. However, director Stuart Baird requested that it be redecorated for its appearance in Star Trek Nemesis, thus, the Mintakan tapestry was removed. Also, the small corridor leading to the bridge was slightly lengthened and the model of the Enterprise was added.
A section of the script for DS9: "Paradise Lost" takes place inside the ready room of the Excelsior-classUSS Lakota, but the same scene in the final version of the episode seems to take place on the ship's bridge. The Okinawa's ready room was mentioned in that episode but never appeared.
Worf and Martok are the only characters who were seen using both the ready rooms aboard the Rotarran and the Ch'Tang.
In the final draft script of "Proving Ground", the Andorian ready room was described as "a small compartment aboard Shran's ship, decorated with personal memorabilia from Shran's career in the Imperial Guard." The room was additionally described as including "a work area" at which the room's occupant could sit and "a small monitor".
In the final draft script of "The Forgotten", Degra's ready room was simply described as "A small private compartment on board Degra's ship."
James Mees was of the opinion that the identity of a ready room's occupant should inform how the room itself looks. "My question is this: Does a ready room always have to have a desk, a chair, and a place for someone else to sit, or does the form and function of the room vary between races?" Mees asked. "To me, it seems clear that different people need different spaces. For instance, Degra's Ready Room is more a working laboratory than an office, because that's what he wants and needs." (Star Trek: Communicator issue 152, p. 36)
David A. Goodman picked fault with the captain's ready rooms whose walls featured Enterprise pictures, such as the ready room aboard the NX-classEnterprise and the equivalent room on the Galaxy-classEnterprise. He thought it unrealistic that a person's office aboard an active spacecraft would have images depicting outer space, rather than trees or other more down-to-earth imagery. Although Chris Black countered that each captain couldn't see their respective spacecraft from the outside, Goodman noted each vessel's external appearance was nonetheless known by its commanding officer. Black settled the debate by reminding Goodman he meanwhile had a picture of his office building on a wall in his own office. ("The Forgotten" audio commentary, ENT Season 3 Blu-ray special features)