Each Class in the Thematic Structure has four Types in the level just below the Class. In the Activity (Physics) Class, for example, the four Types are Learning, Understanding, Doing, and Obtaining. Because the Activity Class will be assigned as the Throughline of one of the four throughlines, one of these Types will be that throughline's Concern. For this example, let us assume that Activity is the Overall Story Throughline, and the Concern is Obtaining.

Because a Concern is a Static Story Point, it is felt throughout the story. Therefore, the Overall Story Characters will remain concerned with Obtaining from the beginning to the end of the story. Even so, these characters do not simply sit around concerned with possessing something; rather, they go through a series of endeavors in the attempt to Obtain it (or get rid of it). As it turns out, each of the four Types in a Throughline represents a stage in this attempt.

In our example, the story might begin with the characters Learning something that eventually brings them to an Understanding. Eventually they Understand enough to start Doing something, and when they have Done enough, they just might Obtain whatever it is they are after. The four stages of this endeavor, then, would be Learning, Understanding, Doing, and Obtaining, in that order.

Another story might start with the characters Doing something. Once they have Done enough, they Obtain something. As they come to examine what they have Obtained, an Understanding grows until, after years of accepting what was, they finally begin to Learn again.

The Types in a Throughline can be explored in any order. Each different order, however, will create a different meaning. As an analogy to this, imagine two events: A slap in the face and a scream. A slap followed by a scream might seem as if someone were crying out because of hit. A scream followed by a slap, however, might seem as if someone was hysterical and hit to bring him to his senses. The order in which events occur changes their Progressive meaning, even though their Static meaning might remain the same. This same dynamic holds true for Acts as well, so the order in which we explore the Types changes the Progressive meaning of that throughline's view of the plot at large.

Each Type in a throughline will be the subject matter of one of four Acts in that throughline. The order in which the Types are explored controls the Progressive meaning of that throughline's evolution.