If your story’s underlying or central problem is seen as a disease, the solution would be the cure. The “Focus”, however, is the principal symptom.
Since the symptoms of a disease are often more apparent than the disease itself, the symptom is called the Focus, because that’s where the attention of the characters is focused.
Even if the characters are aware of the true nature of the problem itself (which they may or may not be), they will be more attentive to the immediate effects created by the Focus.
You can enrich your story and make your characters much more human by having the them focus on various symptoms of the underlying story problem rather than on the problem itself.
Click here for our complete List of Essential Story Points