Graph Opus facilitates an analyst reducing a dramatic work to a sequence of weighted events; GO uses the running total to create a graph, the peak of the graph is the climax of the play, lesser peaks are anticlimaxes.
Negative weight. The event reduces the tension of the dramatic work, the protagonist experiences a negative event; music slows, softens.
Positive weight. The event heightens the tension, is positive for the protagonist; music is played faster, creshendos.
From this, Graph Opus identifies the climax event.