As students become more mature, the material can become more complex and more circles can be added to increase complexity. It makes a fine assessment tool. To use them effectively, they need to be left up for students to refer to often. This means that teachers need to go over the charts with the students to review, revise, and add information. It is in this way that students learn how scientists work.
First scientists brainstorm their thoughts.
As they do so, they ask new questions. By modeling this activity for the students, they learn not only information but process.