The term Preview can carry many meanings. It depends on the house and circumstances of the preview. Here are a few definitions: From this post by [user]lieperjp[/user] 1. Dress rehearsal with a few audience members present to observe and comment on the show. 2. Dress rehearsal for press to come in and review the show before opening night. From this post by [user]Esoteric[/user] 1.Closed preview full tech - Just a final tech rehearsal, but with the designers no longer changing placement and timing of cues, only levels, designers are still in the house on headset. 2.Invited preview full tech - A few invited audience memebers attend, again, designers are still on headsets in the house adjusting cues, but not placement or timing. 3.Open Preview full tech - Open to any who wish to attend, again with designers working in the house. 4.Closed/Invited/Open preview special tech - Same as above but designers are in the house taking notes instead of on headset. Sold preview - Audiences paying to see the preview. This is NEVER a working tech. At the most the designers are in the booth taking notes. Also, a possible display of a lighting console, often called "Blind" showing a lighting state not on stage ("Live").