sentences:  In Villalon and Calvo's (2011) "Concept Maps as Cognitive Visualizations of Writing Assignments", concept maps are discussed as a means of scaffolding university-aged students' ideas in writing, as well as their metacognitive skills.In their study, Villalon and Calvo evaluated a new Concept Map Mining tool, which was used in an "e-learning environment" that automatically generated maps using students' written work (p. 16).The Concept Map Mining tool was used to look at a collection of annotated essays written by undergraduate college students (p. 16).