01 See Moore, S. (1984). The Stanislavski System: The Professional Training of an Actor. Penguin Books. For a film where subtext becomes explicit for comedic effect, see Annie Hall (Woody Allen, 1977, MGM).
Subtext is a theatrical concept which can enrich a rehearsal and give deeper insight and inspiration. The term has several interlocking meanings in theater, but we can think of subtext as the unspoken thoughts of a character, which might be implied by her actions. Put another way, subtext is what we mean, but don’t say. Bringing subtext into an investigative rehearsal can reveal deeper motivations, help us understand needs, and illuminate many new opportunities to create value. 
In theater rehearsal, subtext is usually only talked about as part of an actor’s “notes” or in initial readings of the play. But there are some rehearsal techniques and games (and even a few plays) where subtext is made audible so it can inspire new understanding and directions. In service design, we mostly use rolling subtext and subtext chains.