The user decides which option to take. Well, the obvious thing to do is to continue the process of giving the user options by tacking additional branchpoints onto the structure. We can therefore apply what we know about stories to estimate the appropriate depth of a storytree. A movie, for example, will have many more than ten events or actions in it, and certainly less than ten thousand. In other words, I think that a movie has something like a hundred or a thousand events or actions in it.
Novels tend to be longer, perhaps.
Let's be conservative, then, and assume that our interactive story needs only a hundred events or actions in it. In other words, there will be one hundred plies in our interactive story. We seem to have a problem here. Foldback A variety of solutions have been developed over the years. The storyline folds back on itself.