The ELABORATION or EXTENSION Phase:
This is the phase in which students get to apply the knowledge gained in the lesson to new situations. They can be asked to answer new questions, solve new problems, or address new issues that are based on the concepts learned in a given lesson. A new research project, designing a new experiment, engineering a new model, or identifying real life examples of situations where the learned concepts can be applied, are all examples of how this phase can be conducted. In some situations, activities or assignments used in this phase can actually serve as EVALUATION of student learning.
For example, in my lesson on population growth, after learning the factors that influence human population growth, I ask students to pick various geographical regions of the world, research population growth patterns in their chosen regions and explain those patterns by relating them to the factors we studied. All this is done as separate research projects.