In the exercises folder you downloaded from the Web, you'll find the scenarios of these sample apps in PDF format in the
scenarios folder. Feel free to read those documents and compare them to the finished applications.
When working with Captivate, the scenario is a very important document. Its goal is to guide you during the whole production process. Thanks to the scenario, you'll always have the big picture of the entire project in mind. The scenario will also help you stay within the scope of your project.
That being said, the scenario can, and probably will, evolve during the production process. And this is a good thing! Every teacher knows that his/her own understanding of a given topic increases and changes ...